Change default namespace to stackhpc and release to 4.0.0.0rc1 (Ocata)

ansible/group_vars/all/kolla

@@ -35,10 +35,10 @@ kolla_base_distro: "centos"
 kolla_install_type: "binary"
 
 # Docker namespace to use for Kolla images.
-kolla_docker_namespace: "kolla"
+kolla_docker_namespace: "stackhpc"
 
 # Kolla OpenStack release version. This should be a Docker image tag.
-kolla_openstack_release: "3.0.2"
+kolla_openstack_release: "4.0.0.0rc1"
 
 # Dict mapping names of sources to their definitions for
 # kolla_install_type=source. See kolla.common.config for details.