Add v1beta1 version

[alebedev87]

What's inside:

• New version added in api/v1beta1/
• No conversions added as v1beta1 is identical to v1alpha1
• v1beta1 is the storage version now
• Webhook is moved to api/v1beta1/, it handles only v1beta1 (v1alpha1 objects are also served by API, see the notes)
• Code of the controllers is migrated to v1beta1
• Manifests updated:
  • CRD got a new new version
  • Webhook updated with the new version
  • v1beta1 samples added
• e2e tests migrated to v1beta1, one test is added for the check of v1alpha1 resources

Notes:

• The controller and the validating webhook are setup to work with v1beta1 only. This works out even for the objects created before the upgrade to this version of the operator. Because the version which is being watched/used is the preferred(has to do with the version priority too), so API will take care of making the conversion. This is different from where the objects are stored though. The objects created before the new version was added to CRD are still stored as the previous version until they are touched (patch/update).
• Migration to stable channel is done in a followup PR: https://github.com/openshift/external-dns-operator/pull/146. The reason is to not block other PR as this change needs the CI update (bundle installation).

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alebedev87

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[alebedev87]

/assign @Miciah @arjunrn

[alebedev87]

@Miciah : no, the move of main.go out of cmd/ is not directly related to the migration to v1beta1. It's the new kubebuilder project layout: before it was scaffolding into cmd/, now it's putting main.go in the root of the repository. I updated operator-sdk version meanwhile and the newer version could not scaffold the new api if main.go was not in the root.

[alebedev87]

/retest

[openshift-ci[bot]]

@alebedev87: all tests passed!

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[alebedev87]

/assign @quarterpin

[quarterpin]

/label qe-approved

[Miciah]

/lgtm

[alebedev87]

/label docs-approved /label px-approved