Use'openstack_region_name' in cloudkitty collectors and fetchers

Change-Id: I9fb4151261fba227dda09241bc141826589ad169
Signed-off-by: Rafael Weingärtner <rafael@apache.org>

ansible/roles/cloudkitty/templates/cloudkitty.conf.j2

@@ -44,10 +44,12 @@ services = compute,image{% if enable_cinder | bool %},volume{% endif %},network.
 [keystone_fetcher]
 keystone_version = 3
 auth_section = keystone_authtoken
+region_name = {{ openstack_region_name }}
 
 {% if cloudkitty_collector_backend == "gnocchi" %}
 [gnocchi_collector]
 auth_section = keystone_authtoken
+region_name = {{ openstack_region_name }}
 {% endif %}
 
 [api]