Update version for Liberty
Update version for Liberty

Update the version for Liberty, switching from date-based versioning
to pre-versioning using SemVer. See
http://lists.openstack.org/pipermail/openstack-dev/2015-May/065211.html
and
http://lists.openstack.org/pipermail/openstack-dev/2015-June/067082.html
for details.

Change-Id: I6a35fa0dda798fad93b804d00a46af80f08d475c

ekasitk/sahara,crobby/sahara,egafford/sahara,ekasitk/sahara,zhangjunli177/sahara,openstack/sahara,zhangjunli177/sahara,esikachev/sahara-backup,tellesnobrega/sahara,crobby/sahara,openstack/sahara,zhangjunli177/sahara,esikachev/sahara-backup,tellesnobrega/sahara,crobby/sahara,esikachev/sahara-backup,ekasitk/sahara,egafford/sahara