Comment 32 for bug 1529691

Fix for this bug based on suggestion, what environments have a deployed_before flag in True value for early created clusters. This flag has not presented in envs <8.0. That cause the 500 error instead of 400 "Stop action is forbidden for the cluster".
So how we can setting up deployed_before flag for existing envs?
Do we need to backport patch https://review.openstack.org/#/c/321414/ for =<7.0? It seems that error 500 is similar with bug [1]

https://review.openstack.org/#/c/321414/
https://bugs.launchpad.net/fuel/+bug/1551339