[bugfix]retry is reached but action still success
[bugfix]retry is reached but action still success

now when action like live-migration retry is reached
result is False but action still success
we can add check in do execute method can fix this problem.
close-bug: 1685757

Change-Id: I8390566ec8dcfa3a71b931d5be1b305802ac0b2a

openstack/watcher,openstack/watcher,stackforge/watcher,stackforge/watcher