Use "interface" option for monasca endpoint discovery

The "interface" option was ignored for endpoint discovery. This was leading to
unexpected behaviour.

Change-Id: Ie669d55d06e06dfe2462cc97c7a76c7f59ee4c84
Story: 2006694
Task: 36994
(cherry picked from commit cbb947ae00)

cloudkitty/collector/monasca.py

@@ -106,7 +106,10 @@ class MonascaCollector(collector.BaseCollector):
             CONF,
             COLLECTOR_MONASCA_OPTS,
             auth=self.auth)
-        self.ks_client = ks_client.Client(session=self.session)
+        self.ks_client = ks_client.Client(
+            session=self.session,
+            interface=CONF.collector_monasca.interface,
+        )
         self.mon_endpoint = self._get_monasca_endpoint()
         if not self.mon_endpoint:
             raise EndpointNotFound()

releasenotes/notes/use-interface-param-endpoint-discovery-monasca-collector-7477e86cd7e5acf4.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    The ``interface`` parameter of the ``collector_monasca`` section is now
+    also used for the discovery of the monasca endpoint.