[FeatureRequest: Issue #268] Major upgrade to Terraform SDK 2.0

[dikhan]

What problem does this Pull Request solve?

Please link to the issue number here (issue will be closed when PR is merged): Closes #268

Terraform Plugin SDK v2 Upgrade checklist:

• [x] Dropped Support for Terraform 0.11 and Below
• [x] Version 2 of the Module
• [x] A New Acceptance Testing Driver
• [x] More Support for context.Context
• [x] Support for Diagnostics
• [x] Support for Resource-Level and Field-Level Descriptions
• [x] New Diagnostics-Enabled Map Validators
  • N/A
• [x] Support for Debuggable Provider Binaries
• [x] Support for Provider Metadata
  • N/A
• [x] Louder helper/schema.ResourceData.Set Errors in Testing
  • N/A
• [x] More Consistent Usage of github.com/mitchellh/go-testing-interface
  • N/A
• [x] Corrected Results of helper/acctest.RandIntRange
  • N/A
• [x] Clearer Handling of nil for helper/resource.NonRetryableError and helper/resource.RetryableError
  • N/A
• [x] More Robust Handling of helper/schema.TypeSet Hashes
  • N/A
• [x] Stronger Validation for helper/schema.Schema.Computed Fields
  • N/A, the OpenAPI Terraform provider does not support/allow Computed properties that are not Optional.
• [x] More Robust Validation of helper/schema.TypeMap Elems
• [x] More Robust Validation of helper/resource.TestCheckResourceAttrPair
  • N/A: helper/resource.TestCheckResourceAttrPair are not used at the moment
• [x] More Robust Validation of Test Sweepers
  • N/A
• [x] Deprecation of helper/schema.ExistsFunc
  • N/A: helper/schema.ExistsFunc was not supported already
• [x] Deprecation of helper/schema.SchemaValidateFunc
• [x] Removal of helper/mutexkv Package
  • N/A: helper/mutexkv Package was not used
• [x] Removal of helper/pathorcontents Package
  • N/A: helper/pathorcontents Package was not used
• [x] Removal of httpclient Package
  • New feature request created: https://github.com/dikhan/terraform-provider-openapi/issues/276
• [x] Removal of helper/hashcode Package
  • Replaced with hash/crc32 Package instead as advised
• [x] Removal of the acctest Package
  • N/A: acctest Package was not used
• [x] Removal of the terraform.ResourceProvider Interface
• [x] Removal of the helper/schema.Provider.StopContext method
  • N/A: helper/schema.Provider.StopContext method was not used
• [x] Removal of helper/schema.ResourceData.SetPartial
  • N/A: helper/schema.ResourceData.SetPartial was not used
• [x] Removal of the helper/schema.Provider.MetaReset property
  • N/A: helper/schema.Provider.MetaReset was not used
• [x] Removal of Deprecated Validation Functions
  • N/A: Validation Functions was not used
• [x] Removal of helper/schema.Schema.PromoteSingle
  • N/A: helper/schema.Schema.PromoteSingle was not used
• [x] Removal of helper/schema.ResourceData.UnsafeSetFieldRaw
  • N/A: helper/schema.ResourceData.UnsafeSetFieldRaw was not used
• [x] Removal of helper/schema.Resource.Refresh
  • N/A: helper/schema.Schema.Refresh was not used
• [x] Removal of helper/schema.Schema.Removed
  • N/A: helper/schema.Schema.Removed was not used
• [x] Removal of helper/encryption Package
  • N/A: helper/encryption Package was not used
• [x] Removal of Discouraged Variables, Functions, Types, and Interfaces
  • N/A

Type of change

What type of change does your code introduce to the provider? Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] New feature (change that adds new functionality)
• [ ] Bug-fix (change that fixes current functionality)
• [ ] Tech debt (enhances the current functionality)
• [x] New release (pumps the version)

Checklist

Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] I have read and followed the CONTRIBUTING guidelines
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have made sure code compiles correctly and all tests are passing by running make test-all
• [x] I have added/updated necessary documentation (if appropriate)
• [x] I have added the following info to the title of the PR (pick the appropriate option for the type of change). This is important because the release notes will include this information.
  • [x] Feature Request: PRs related to feature requests should have in the title [FeatureRequest: Issue #X] <PR Title>
  • [ ] Bug Fixes: PRs related to bug fixes should have in the title [BugFix: Issue #X] <PR Title>
  • [ ] Tech Debt: PRs related to technical debt should have in the title [TechDebt: Issue #X] <PR Title>
  • [ ] New Release: PRs related to a new release should have in the title [NewRelease] vX.Y.Z

Checklist for Admins

• [x] Label is populated
• [x] PR is assigned to the corresponding project
• [x] PR has at least 1 reviewer and 1 assignee

[codecov[bot]]

Codecov Report

Merging #274 (2f1f61a) into master (5d335a8) will increase coverage by 1.03%. The diff coverage is 68.49%.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
+ Coverage   90.97%   92.00%   +1.03%     
==========================================
  Files          61       60       -1     
  Lines        3091     3041      -50     
==========================================
- Hits         2812     2798      -14     
+ Misses        184      164      -20     
+ Partials       95       79      -16     

Impacted Files	Coverage Δ
openapi/openapi_client.go	84.54% <ø> (ø)
openapi/openapi_spec_header.go	100.00% <ø> (ø)
openapi/openapi_spec_resource_schema_definition.go	97.36% <ø> (ø)
.../openapi_spec_security_definition_apikey_header.go	100.00% <ø> (ø)
...i_spec_security_definition_apikey_header_bearer.go	100.00% <ø> (ø)
...i/openapi_spec_security_definition_apikey_query.go	100.00% <ø> (ø)
...pi_spec_security_definition_apikey_query_bearer.go	100.00% <ø> (ø)
...i_spec_security_definition_apikey_refresh_token.go	84.21% <ø> (ø)
openapi/openapi_spec_security_schemes.go	100.00% <ø> (ø)
openapi/openapi_stub_backend_configuration.go	86.66% <ø> (ø)
... and 24 more

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