azure_rm_diskencryptionset - Add managed identity support

[nirarg]

SUMMARY

Add managed identity support to "azure_rm_diskencryptionset" module

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

azure_rm_diskencryptionset

ADDITIONAL INFORMATION

[nirarg]

Current status:
Has an issue to run with user assigned identity
Need to grant get, wrap and unwrap key permissions to user-assigned identity
Changes required in the integration test preparation steps
Work in progress

fatal: [localhost]: FAILED! => {"changed": false, "msg": "Error creating or updating disk encryption set des7500d96e289d3d0663a893 - (KeyVaultAccessForbidden) Unable to access key vault resource '********' to enable encryption at rest. Please grant get, wrap and unwrap key permissions to user-assigned identity '/subscriptions/bb273dab-fa83-4ae8-b5b6-a0384d20bb4a/resourcegroups/nargaman-eastus/providers/Microsoft.ManagedIdentity/userAssignedIdentities/ansible-test-diskencriptionset-identity'. Please visit https://aka.ms/keyvaultaccessssecmk for more information.\nCode: KeyVaultAccessForbidden\nMessage: Unable to access key vault resource '********' to enable encryption at rest. Please grant get, wrap and unwrap key permissions to user-assigned identity '/subscriptions/bb273dab-fa83-4ae8-b5b6-a0384d20bb4a/resourcegroups/nargaman-eastus/providers/Microsoft.ManagedIdentity/userAssignedIdentities/ansible-test-diskencriptionset-identity'. Please visit https://aka.ms/keyvaultaccessssecmk for more information."}

[p3ck]

I took your suggestion and updated the test cases to grant the proper permission for the keyvault to the user assigned identities. Had to make a few other changes as well and the code should restrict to only one user_assigned_identity.

p3ck@110ee1a

You can see my changes there. Feel free to cherry pick and change as needed.

[nirarg]

The PR is completed and ready for review
CI execution was started, for more details:
https://dev.azure.com/azclitools/public/_build/results?buildId=183285&view=results