Make repo compliant

[RaphaelVogel]

What this PR does / why we need it:

• Changed LICENSE_BOILERPLATE.txt to use SPDX headers for generated code
• Created/Updated LICENSE file
  • Deleted LICENSE.md file
• Created/Updated .reuse/dep5 file
  • Added copied source code files from kubernetes
• Created/Updated LICENSES folder
• Deleted NOTICE.md file
• Added badge for reuse compliance in README.md file and registered repo with REUSE API
• License/Copyright header replacement for 'non-go' files
  • Dockerfile
  • .ci/test
  • .ci/prepare_release
  • .ci/build
  • .ci/integrationtest
  • .ci/check
  • test/integration/run.sh
  • test/functional/run.sh
  • hack/common.sh
  • hack/generate-code
  • hack/generate-controller-registration.sh
  • hack/install-requirements.sh
• License/Copyright header replacement for 'go' files
  • cmd/play/main.go
  • pkg/controller/source/gateways/istio/handler_test.go
  • pkg/controller/source/gateways/gatewayapi/handler_test.go
  • pkg/controller/provider/infoblox/handler.go
  • pkg/controller/provider/infoblox/factory.go
  • pkg/controller/provider/infoblox/access.go
  • pkg/controller/provider/infoblox/util.go
  • pkg/controller/provider/infoblox/state.go
  • pkg/controller/provider/infoblox/controller/controller.go
  • pkg/controller/annotation/controller.go
  • pkg/controller/annotation/annotations/state.go
  • pkg/controller/remoteaccesscertificates/controller.go
  • pkg/dns/const.go
  • pkg/dns/source/feedback.go
  • pkg/dns/source/state.go
  • pkg/dns/provider/references.go
  • pkg/dns/provider/state_secret.go
  • pkg/dns/provider/state_owner.go
  • pkg/dns/provider/state_zonepolicy.go
  • pkg/dns/provider/state_zone.go
  • pkg/dns/provider/state_entry.go
  • pkg/dns/provider/state_provider.go
  • pkg/dns/provider/state_statistic.go
  • pkg/dns/provider/dedicatedrecord.go
  • pkg/dns/provider/ownercache_test.go
  • pkg/dns/provider/statistic/statistic.go
  • pkg/dns/provider/raw/records.go
  • pkg/dns/utils/schedule_test.go
  • pkg/dns/utils/trylock_test.go
  • pkg/dns/utils/target.go
  • pkg/dns/utils/ratelimiter.go
  • pkg/dns/utils/schedule.go
  • cmd/compound/main.go
  • cmd/dedicated/main.go
  • test/integration/privateZones_test.go
  • test/integration/providerSecret_test.go
  • test/integration/serviceAnnotation_test.go
  • test/integration/istioGatewayAnnotation_test.go
  • test/integration/entryLivecycle_test.go
  • test/integration/dnsActivation_test.go
  • test/integration/singleEntryTwoProviders_test.go
  • test/integration/k8sgatewayAnnotation_test.go
  • test/integration/testenv.go
  • test/integration/ingressAnnotation_test.go
  • test/integration/singleEntryOneProvider_test.go
  • test/integration/manyEntriesOneProvider_test.go
  • test/integration/helpers_test.go
  • test/integration/remoteAccess_test.go
  • test/integration/providerRateLimits_test.go
  • test/integration/suite_test.go
  • test/integration/manyEntriesManyProviders_test.go
  • test/functional/suite.go
  • test/functional/basics.go
  • test/functional/routingpolicies.go
  • test/functional/suite_test.go
  • test/functional/config/config.go
  • test/functional/config/dnslookup.go
  • test/functional/config/utils.go
  • test/functional/config/dnslookup_test.go
  • charts/external-dns-management/doc.go
  • pkg/apis/dns/register.go
  • pkg/apis/dns/v1alpha1/register.go
  • pkg/apis/dns/v1alpha1/dnslock.go
  • pkg/apis/dns/v1alpha1/dnsannotation.go
  • pkg/apis/dns/v1alpha1/remoteaccesscertificate.go
  • pkg/apis/dns/v1alpha1/dnsowner.go
  • pkg/apis/dns/v1alpha1/dnshostedzonepolicy.go
  • pkg/apis/dns/v1alpha1/doc.go
  • pkg/apis/dns/v1alpha1/dnsentry.go
  • pkg/apis/dns/v1alpha1/state.go
  • pkg/apis/dns/v1alpha1/dnsprovider.go
  • pkg/server/metrics/metrics.go
  • pkg/server/pprof/profiling.go
  • pkg/server/remote/server.go
  • pkg/server/remote/memorylogger.go
  • pkg/server/remote/utils.go
  • pkg/server/remote/state.go
  • pkg/server/remote/embed/dynamictransportcreds.go
  • pkg/server/remote/embed/remoteserver.go
  • pkg/server/remote/common/types.go
  • pkg/server/remote/conversion/conversion.go
  • pkg/server/remote/conversion/conversion_test.go
  • pkg/controller/source/ingress/handler.go
  • pkg/controller/source/ingress/controller.go
  • pkg/controller/source/gateways/istio/handler.go
  • pkg/controller/source/gateways/istio/controller.go
  • pkg/controller/source/gateways/istio/virtualservicesReconciler.go
  • pkg/controller/source/gateways/istio/targetSourcesReconciler.go
  • pkg/controller/source/gateways/istio/state_test.go
  • pkg/controller/source/gateways/istio/state.go
  • pkg/controller/source/gateways/crdwatch/controller.go
  • pkg/controller/source/gateways/gatewayapi/httproutesReconciler.go
  • pkg/controller/source/gateways/gatewayapi/handler.go
  • pkg/controller/source/gateways/gatewayapi/controller.go
  • pkg/controller/source/gateways/gatewayapi/state_test.go
  • pkg/controller/source/gateways/gatewayapi/state.go
  • pkg/controller/source/service/handler.go
  • pkg/controller/source/service/controller.go
  • pkg/controller/source/dnsentry/handler.go
  • pkg/controller/source/dnsentry/controller.go
  • pkg/controller/provider/alicloud/handler.go
  • pkg/controller/provider/alicloud/factory.go
  • pkg/controller/provider/alicloud/access.go
  • pkg/controller/provider/alicloud/state.go
  • pkg/controller/provider/alicloud/controller/controller.go
  • pkg/controller/provider/openstack/factory.go
  • pkg/controller/provider/openstack/controller/controller.go
  • pkg/controller/provider/azure/factory.go
  • pkg/controller/provider/azure/controller/controller.go
  • pkg/controller/provider/google/handler.go
  • pkg/controller/provider/google/execution.go
  • pkg/controller/provider/google/google_suite_test.go
  • pkg/controller/provider/google/factory.go
  • pkg/controller/provider/google/routingpolicy.go
  • pkg/controller/provider/google/execution_test.go
  • pkg/controller/provider/google/controller/controller.go
  • pkg/controller/provider/mock/factory.go
  • pkg/controller/provider/mock/controller/controller.go
  • pkg/controller/provider/azure-private/factory.go
  • pkg/controller/provider/azure-private/controller/controller.go
  • pkg/controller/provider/cloudflare/factory.go
  • pkg/controller/provider/cloudflare/access.go
  • pkg/controller/provider/cloudflare/state.go
  • pkg/controller/provider/cloudflare/controller/controller.go
  • pkg/controller/provider/netlify/factory.go
  • pkg/controller/provider/netlify/access.go
  • pkg/controller/provider/netlify/state.go
  • pkg/controller/provider/netlify/controller/controller.go
  • pkg/controller/provider/compound/factory.go
  • pkg/controller/provider/compound/controller/controller.go
  • pkg/controller/provider/aws/handler.go
  • pkg/controller/provider/aws/execution.go
  • pkg/controller/provider/aws/factory.go
  • pkg/controller/provider/aws/routingpolicy.go
  • pkg/controller/provider/aws/aliastarget.go
  • pkg/controller/provider/aws/controller/controller.go
  • pkg/controller/provider/aws/data/canonicalhostedzones.go
  • pkg/controller/provider/rfc2136/factory.go
  • pkg/controller/provider/rfc2136/controller/controller.go
  • pkg/controller/provider/remote/handler.go
  • pkg/controller/provider/remote/factory.go
  • pkg/controller/provider/remote/controller/controller.go
  • pkg/controller/replication/dnsprovider/handler.go
  • pkg/controller/replication/dnsprovider/controller.go
  • pkg/controller/replication/dnsprovider/slaves.go
  • pkg/controller/remoteaccesscertificates/certificate.go
  • pkg/dns/mapping_test.go
  • pkg/dns/cache.go
  • pkg/dns/records.go
  • pkg/dns/dnssetname.go
  • pkg/dns/routingpolicy.go
  • pkg/dns/utils.go
  • pkg/dns/dnsset.go
  • pkg/dns/validation.go
  • pkg/dns/mapping.go
  • pkg/dns/zoneid.go
  • pkg/dns/validation_test.go
  • pkg/dns/source/controller.go
  • pkg/dns/source/reconciler.go
  • pkg/dns/source/slaves.go
  • pkg/dns/source/interface.go
  • pkg/dns/source/dnsinfo.go
  • pkg/dns/source/defaults.go
  • pkg/dns/source/utils.go
  • pkg/dns/source/ownerreconciler.go
  • pkg/dns/provider/provider.go
  • pkg/dns/provider/config.go
  • pkg/dns/provider/controller.go
  • pkg/dns/provider/advancedopts.go
  • pkg/dns/provider/changemodel.go
  • pkg/dns/provider/factory.go
  • pkg/dns/provider/interface.go
  • pkg/dns/provider/statusupdate.go
  • pkg/dns/provider/remote.go
  • pkg/dns/provider/target.go
  • pkg/dns/provider/entry.go
  • pkg/dns/provider/zone.go
  • pkg/dns/provider/context.go
  • pkg/dns/provider/utils.go
  • pkg/dns/provider/default.go
  • pkg/dns/provider/state.go
  • pkg/dns/provider/ownercache.go
  • pkg/dns/provider/const.go
  • pkg/dns/provider/foreign.go
  • pkg/dns/provider/ratelimiter.go
  • pkg/dns/provider/ticker.go
  • pkg/dns/provider/selection/selection_test.go
  • pkg/dns/provider/selection/selection.go
  • pkg/dns/provider/errors/handlererror.go
  • pkg/dns/provider/errors/errors.go
  • pkg/dns/provider/raw/execution.go
  • pkg/dns/utils/utils_entry.go
  • pkg/dns/utils/utils_provider.go
  • pkg/dns/utils/utils.go
  • pkg/dns/utils/utils_zonepolicy.go
  • pkg/dns/utils/utils_dns.go
  • pkg/dns/utils/trylock.go
  • pkg/dns/utils/utils_lock.go
  • pkg/dns/utils/utils_owner.go
  • pkg/dns/utils/parallel.go
  • hack/tools.go
  • pkg/dns/provider/selection/selection_suite_test.go
  • pkg/controller/provider/openstack/handler.go
  • pkg/controller/provider/openstack/execution.go
  • pkg/controller/provider/openstack/designateclient.go
  • pkg/controller/provider/openstack/handler_test.go
  • pkg/controller/provider/azure/handler.go
  • pkg/controller/provider/azure/execution.go
  • pkg/controller/provider/azure/utils/utils_test.go
  • pkg/controller/provider/azure/utils/utils.go
  • pkg/controller/provider/mock/handler.go
  • pkg/controller/provider/azure-private/handler.go
  • pkg/controller/provider/azure-private/execution.go
  • pkg/controller/provider/cloudflare/handler.go
  • pkg/controller/provider/netlify/handler.go
  • pkg/controller/provider/rfc2136/handler.go
  • pkg/controller/provider/rfc2136/execution.go
  • pkg/dns/provider/inmemory.go
  • pkg/dns/provider/zonecache.go