Fix some issues in m4 test (#671)

* Add databricks, fix several issues

* Fixed a completer related issue and add support for credential

* Add two m4 configuration and fix some issues

* Add support for enum with one value

* Fixed an enum related issue and add some RPs in the test

* Fix some issues in m4 test

Author: dolauli

tests-upgrade/functions/helpers/KeyVault/readme.noprofile.md

@@ -10,8 +10,6 @@ input-file:
 # subject-prefix: ''
 
 directive:
-  # Remove unnedded cmdlets
-  - remove-operation: Operations_List
   # hide all cmdlets
   - where:
       subject: ^VaultDeleted$|^Vault$|^VaultNameAvailability$|^VaultAccessPolicy$

tests-upgrade/functions/helpers/ManagedIdentity/readme.noprofile.md

@@ -11,7 +11,9 @@ subject-prefix: ''
 
 directive:
   # Remove unnedded cmdlets
-  - remove-operation: Operations_List
+  - where:
+      subject: ^Operation$
+    remove: true
 
   # Hide Storage Account cmdlets
   - where:

tests-upgrade/functions/helpers/Storage/readme.noprofile.md

@@ -53,7 +53,7 @@ In this directory, run AutoRest:
 require:
   - $(this-folder)/../../../readme.azure.noprofile.md
 input-file:
-  #- $(repo)/specification/storage/resource-manager/Microsoft.Storage/stable/2019-04-01/storage.json
+  - $(repo)/specification/storage/resource-manager/Microsoft.Storage/stable/2019-04-01/storage.json
   - $(repo)/specification/storage/resource-manager/Microsoft.Storage/stable/2019-04-01/blob.json
 
 subject-prefix: ''