Upgrades, copy release versions during openstack upgrade

Openstack releases have different release
cycle and their own versions, files with
versions will be delivered in tar ball
and then user will be able to see the
list of versions which his system consists
of via nailgun api.

Change-Id: Ibb65dffa4142746427ef41a259d1671973691a96
Related-bug: #1365087
Merge "Upgrades, copy release versions during openstack upgrade"