Update install guide version with Liberty version
Update install guide version with Liberty version

Change-Id: I6483122c27137fbc2766bf29d85b2b55cf02ce96

AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals