Add multi-region support for Magnum

Magnum currently tries to hit the first region that it finds
so it can fail to deploy clusters in multi-region deployments
non-determinsitically.

This patch makes sure that the region can be configured and
it defaults to the same one that Magnum is deployed on.

Change-Id: I136ba0caead3a5afe11152aaed7bae94af8906b4

defaults/main.yml

@@ -42,7 +42,12 @@ magnum_service_project_name: service
 magnum_service_role_names:
   - admin
 magnum_service_region: RegionOne
+magnum_barbican_service_region: "{{ magnum_service_region }}"
 magnum_cinder_service_region: "{{ magnum_service_region }}"
+magnum_glance_service_region: "{{ magnum_service_region }}"
+magnum_heat_service_region: "{{ magnum_service_region }}"
+magnum_neutron_service_region: "{{ magnum_service_region }}"
+magnum_nova_service_region: "{{ magnum_service_region }}"
 magnum_bind_port: 9511
 magnum_service_publicuri_proto: http
 magnum_service_publicurl: "{{ magnum_service_publicuri_proto }}://{{ external_lb_vip_address }}:{{ magnum_bind_port }}"

templates/magnum.conf.j2

@@ -14,6 +14,7 @@ host = {{ ansible_host }}
 send_cluster_metrics = False
 
 [barbican_client]
+region_name = {{ magnum_barbican_service_region }}
 endpoint_type = internalURL
 
 [cinder_client]
@@ -24,9 +25,11 @@ endpoint_type = internalURL
 connection = mysql+pymysql://{{ magnum_galera_user }}:{{ magnum_galera_password }}@{{ magnum_galera_address }}/{{ magnum_galera_database_name }}?charset=utf8{% if magnum_galera_use_ssl | bool %}&ssl_ca={{ magnum_galera_ssl_ca_cert }}{% endif %}
 
 [glance_client]
+region_name = {{ magnum_glance_service_region }}
 endpoint_type = internalURL
 
 [heat_client]
+region_name = {{ magnum_heat_service_region }}
 endpoint_type = internalURL
 
 [keystone_auth]
@@ -60,12 +63,15 @@ username = {{ magnum_service_user_name }}
 password = {{ magnum_service_password }}
 
 [magnum_client]
+region_name = {{ magnum_service_region }}
 endpoint_type = publicURL
 
 [neutron_client]
+region_name = {{ magnum_neutron_service_region }}
 endpoint_type = internalURL
 
 [nova_client]
+region_name = {{ magnum_nova_service_region }}
 endpoint_type = internalURL
 
 [oslo_messaging_notifications]