Update lookup plugins to support ENV vars

[p3ck]

SUMMARY

By using the AzureRMAuth class we are consistent with how all modules create their credentials.

Also fix inconsistencies with how client_id, secret and tenant are specified.

Fixes: #1777

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

plugins/lookup/azure_keyvault_secret.py
plugins/lookup/azure_service_principal_attribute.py

ADDITIONAL INFORMATION

Now the following wotks by picking up the credentials via the environment variables.

    - name: Set key vault secret fact
      ansible.builtin.set_fact: secretValue={{ lookup('azure.azcollection.azure_keyvault_secret','adminPassword',vault_url=keyvaulturi, use_msi=false) }}

[p3ck]

FYI - azure_cloud.get_cloud_from_metadata_endpoint does not exist in azure.cli.core

[zunyangc]

Hi @magodo, all tests passed, please procced to merge.

[zunyangc]

Will add test to cover this in pipeline.