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

scality/cinder,mahak/cinder,winndows/cinder,duhzecca/cinder,nexusriot/cinder,dims/cinder,apporc/cinder,potsmaster/cinder,nikesh-mahalka/cinder,eharney/cinder,manojhirway/ExistingImagesOnNFS,j-griffith/cinder,CloudServer/cinder,eharney/cinder,dims/cinder,openstack/cinder,Paul-Ezell/cinder-1,tlakshman26/cinder-new-branch,Nexenta/cinder,Datera/cinder,scottdangelo/RemoveVolumeMangerLocks,j-griffith/cinder,nikesh-mahalka/cinder,phenoxim/cinder,CloudServer/cinder,NetApp/cinder,petrutlucian94/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,tlakshman26/cinder-bug-fix-volume-conversion-full,mahak/cinder,takeshineshiro/cinder,NetApp/cinder,JioCloud/cinder,JioCloud/cinder,nexusriot/cinder,sasukeh/cinder,cloudbase/cinder,manojhirway/ExistingImagesOnNFS,potsmaster/cinder,scality/cinder,Hybrid-Cloud/cinder,sasukeh/cinder,Nexenta/cinder,winndows/cinder,bswartz/cinder,leilihh/cinder,tlakshman26/cinder-https-changes,tlakshman26/cinder-https-changes,tlakshman26/cinder-new-branch,ge0rgi/cinder,leilihh/cinder,bswartz/cinder,duhzecca/cinder,openstack/cinder,Datera/cinder,apporc/cinder,cloudbase/cinder,Paul-Ezell/cinder-1,takeshineshiro/cinder,Hybrid-Cloud/cinder,petrutlucian94/cinder,phenoxim/cinder,scottdangelo/RemoveVolumeMangerLocks