Merge pull request #1225 from bennerv/ext-nit

Reconcile more of az aro extension with azure-cli

python/az/aro/azext_aro/_aad.py

@@ -17,7 +17,7 @@ from knack.log import get_logger
 logger = get_logger(__name__)
 
 
-class AADManager(object):
+class AADManager:
     MANAGED_APP_PREFIX = 'https://az.aro.azure.com/'
 
     def __init__(self, cli_ctx):