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: Ida50fc2a187f08e0da53f27ae88e9ccce4f6b862

openstack/sahara-extra,openstack/sahara-extra,openstack/sahara-extra,openstack/sahara-extra