Change shade keystone v2 job for stable/liberty
Change shade keystone v2 job for stable/liberty

Keystone v2 will eventually be phased out of use. Shade supports
both keystone v2 and v3, but we should pin our support of v2 to
stable/liberty to prevent future breakages.

Change-Id: I5711397bdf1c71fae11ca380348949a0381ab806

noorul/os-project-config,openstack-infra/project-config,openstack-infra/project-config,dongwenjuan/project-config,noorul/os-project-config,dongwenjuan/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config