[AD] Fix race condition in AD 1-click template that caused stack creation failure.

The fix consists making the Post custom resource wait for the AdAdminNode to complete the registration of users.

Author: gmarciani

cloudformation/ad/ad-integration.yaml

@@ -622,6 +622,8 @@ Resources:
 
   Post:
     Type: Custom::PostLambda
+    DependsOn:
+      - AdDomainAdminNodeWaitCondition
     Properties:
       ServiceToken: !GetAtt PostLambda.Arn
       AdminNodeInstanceId: !Ref AdDomainAdminNode