Comment 1 for bug 1368445

Set High priority as it affects operations story. I believe we should have test for it. Can be easily checked by the following:

Lightweight test, can be considered as extension to HA-scale up test:
1) Run HA deployment with one controller
2) Add one/two more controllers, deploy
3) Check rabbit_hosts in compute config file, it must have >1 IP address in the list (2 or 3, depends how many controllers finally in env)

Heavy test, but can handle more issues:
1) Run HA deployment with one controller and one compute, run OSTF
2) Add two more controllers, run OSTF
3) Destroy first(initial) controller, run OSTF.
OSTF should pass in all 3 steps. It won't in step #3 at the current moment without redeployment of compute nodes on every controller-add.