Fix Keytone API Version
Fix Keytone API Version

- OS_IDENTITY_API_VERSION should be set:
  * to 2.0 if v2.0
  * to 3 if v3

Change-Id: Id7706cda025eee9d2b36da34ef22b3f5ba902ec8
Fixes: rhbz#1236229
Signed-off-by: Gael Chamoulaud <68646863a1a9108d0246eb96cb6356f9fa9a34f3@redhat.com>

imcsk8/packstack,mahak/packstack,imcsk8/packstack,stackforge/packstack,imcsk8/packstack,xbezdick/packstack,mahak/packstack,xbezdick/packstack,openstack/packstack,xbezdick/packstack,openstack/packstack,fr34k8/packstack,openstack/packstack,fr34k8/packstack,fr34k8/packstack,mahak/packstack,stackforge/packstack,stackforge/packstack