Compute v2 api server status value cleanup

Server status need to be updated to reflect current standards.
Adding statuses like STOPPED, PAUSED, SOFT_DELETED and updating
old values to new ones like RESCUED, RESIZED, DELETED.

Change-Id: I0926e2d1f51f8a8b5665cc8782ed421f8d56a4d7
Closes-Bug: #1362845
Merge "Compute v2 api server status value cleanup"