Description of problem: Currently, it is necessary to stop services to upgrade OpenStack, and OpenStack needs to be upgraded with every verison. (Ex. Kilo->Liberty, Liberty->Mitaka) We need a smooth upgrade where OpenStack can be upgraded without stopping resources already provisioned, and it allows skip of some versions. (Ex. Kilo -> Mitaka, Icehouce->Mitaka)
*** This bug has been marked as a duplicate of bug 1309608 ***