Fix Masakari in multi-region deploys

to behave like it is most commonly expected - query Nova in the
same region.

Closes-Bug: #1939291
Change-Id: I584a83d352c747a799b5dab1d3b8159ba3805454

ansible/roles/masakari/templates/masakari.conf.j2

@@ -6,6 +6,7 @@ masakari_api_listen_port = {{ masakari_api_port }}
 enabled_apis = masakari_api
 state_path = /var/lib/masakari
 transport_url = {{ rpc_transport_url }}
+os_region_name = {{ openstack_region_name }}
 os_user_domain_name = {{ default_user_domain_id }}
 os_project_domain_name = {{ default_project_domain_id }}
 os_privileged_user_tenant = service

releasenotes/notes/bug-1939291-bf2e405d286e4b07.yaml

+---
+fixes:
+  - |
+    Fixes Masakari in multi-region deployments to query Nova API in its
+    own region.
+    `LP#1939291 <https://launchpad.net/bugs/1939291>`__