Disable adding new controllers in operational cluster in HA mode

Added translation for warning message and new condition to disable role in
operational HA environment

Change-Id: I5d8f35276a43abe393adf9c2596f6efe6cdf72c8
Relates-to-bp: disable-ability-to-add-controllers-in-ha
Merge "Disable adding new controllers in operational cluster in HA mode"