[DCS] improve import in opentelekomcloud_dcs_instance_v1 and refactoring resource/opentelekomcloud_dcs_*

[anton-sidelnikov]

Summary of the Pull Request

PR Checklist

• Refers to: OTC DCS import #1992
• Tests added/passed.
• Documentation updated.
• Schema updated.
• Release notes added.

Acceptance Steps Performed

=== RUN   TestAccDcsAZV1DataSource_basic
=== PAUSE TestAccDcsAZV1DataSource_basic
=== CONT  TestAccDcsAZV1DataSource_basic
--- PASS: TestAccDcsAZV1DataSource_basic (41.02s)
PASS


Process finished with the exit code 0

=== RUN   TestAccDcsMaintainWindowV1DataSource_basic
=== PAUSE TestAccDcsMaintainWindowV1DataSource_basic
=== CONT  TestAccDcsMaintainWindowV1DataSource_basic
--- PASS: TestAccDcsMaintainWindowV1DataSource_basic (38.57s)
PASS


Process finished with the exit code 0

=== RUN   TestAccDcsProductV1DataSource_basic
=== PAUSE TestAccDcsProductV1DataSource_basic
=== CONT  TestAccDcsProductV1DataSource_basic
--- PASS: TestAccDcsProductV1DataSource_basic (43.60s)
PASS


Process finished with the exit code 0

=== RUN   TestAccDcsInstancesV1_basic
=== PAUSE TestAccDcsInstancesV1_basic
=== CONT  TestAccDcsInstancesV1_basic
--- PASS: TestAccDcsInstancesV1_basic (165.16s)
=== RUN   TestAccDcsInstancesV1_basicSingleInstance
=== PAUSE TestAccDcsInstancesV1_basicSingleInstance
=== CONT  TestAccDcsInstancesV1_basicSingleInstance
--- PASS: TestAccDcsInstancesV1_basicSingleInstance (120.50s)
=== RUN   TestAccDcsInstancesV1_basicEngineV3Instance
=== PAUSE TestAccDcsInstancesV1_basicEngineV3Instance
=== CONT  TestAccDcsInstancesV1_basicEngineV3Instance
=== RUN   TestAccASV1Configuration_invalidSecurityGroup
=== PAUSE TestAccASV1Configuration_invalidSecurityGroup
=== CONT  TestAccASV1Configuration_invalidSecurityGroup
--- PASS: TestAccASV1Configuration_invalidSecurityGroup (53.49s)
=== RUN   TestAccASV1Configuration_invalidEngineVersion
=== PAUSE TestAccASV1Configuration_invalidEngineVersion

=== CONT  TestAccASV1Configuration_invalidEngineVersion
--- PASS: TestAccASV1Configuration_invalidEngineVersion (44.40s)
=== RUN   TestAccASV1Configuration_WhitelistValidation
=== PAUSE TestAccASV1Configuration_WhitelistValidation
=== CONT  TestAccASV1Configuration_WhitelistValidation
--- PASS: TestAccASV1Configuration_WhitelistValidation (45.35s)
=== RUN   TestAccDcsInstancesV1_Whitelist
=== PAUSE TestAccDcsInstancesV1_Whitelist
=== CONT  TestAccDcsInstancesV1_Whitelist

--- PASS: TestAccDcsInstancesV1_Whitelist (252.90s)
=== RUN   TestAccDCSInstanceV1_importBasic
--- PASS: TestAccDCSInstanceV1_importBasic (123.82s)
--- PASS: TestAccDcsInstancesV1_basicEngineV3Instance (439.09s)
PASS


Process finished with the exit code 0

[otc-zuul]

Build succeeded.
https://zuul.otc-service.com/t/eco/buildset/4f26a2fbdf7c41e4b65109aca9380b3a

✔️ build-otc-releasenotes SUCCESS in 3m 12s
✔️ otc-golangci-lint SUCCESS in 2m 49s
✔️ golang-make-test SUCCESS in 3m 04s
✔️ golang-make-vet SUCCESS in 2m 36s
✔️ tflint SUCCESS in 1m 41s
✔️ goreleaser-build SUCCESS in 7m 33s