Adding infra for displaying error message for user management in cli (#…

…161)

CLI/actioner/sonic-cli-sys.py

@@ -101,6 +101,10 @@ def invoke(func, args):
 
 def run(func, args):
     api_response = invoke(func, args)
+
+    if api_response is not None and api_response.errors():
+        print((api_response.error_message()))
+        return
     if api_response.ok():
         if api_response.content is not None:
             response = api_response.content