Azure: added auth_source to override the source of the credentials (#35213)

* Azure: added auth_source to override the source of the credentials

* removed broken cli auth and fix some review changes

* missed some more cli auth stuff that isn't required

* Added cli auth back in

* Added docs around cli auth

* fix azure CLI auth issues

* tweak error messages
* fix auto fallback to cli
* fix import issues when azure-cli not installed

lib/ansible/utils/module_docs_fragments/azure.py

@@ -76,6 +76,20 @@ options:
         choices: [validate, ignore]
         default: null
         version_added: 2.5
+    auth_source:
+        description:
+            - Controls the source of the credentials to use for authentication.
+            - C(auto) will follow the default precedence of module parameters -> environment variables -> default profile in credential file
+              C(~/.azure/credentials).
+            - When set to C(cli), the credentials will be sources from the default Azure CLI profile.
+            - Can also be set via the C(ANSIBLE_AZURE_AUTH_SOURCE) environment variable.
+        choices:
+        - auto
+        - cli
+        - credential_file
+        - env
+        default: auto
+        version_added: 2.5
 requirements:
     - "python >= 2.7"
     - "azure >= 2.0.0"