Integration of OSM Charms with new MongoDB

Change-Id: I9e723dc94ff4c5b7e691179be4e9e3c7b43b6ab0
Signed-off-by: Dario Faccin <dario.faccin@canonical.com>
diff --git a/installers/charm/osm-pol/metadata.yaml b/installers/charm/osm-pol/metadata.yaml
index d6bb35a..adf189a 100644
--- a/installers/charm/osm-pol/metadata.yaml
+++ b/installers/charm/osm-pol/metadata.yaml
@@ -56,7 +56,7 @@
     interface: kafka
     limit: 1
   mongodb:
-    interface: mongodb
+    interface: mongodb_client
     limit: 1
   mysql:
     interface: mysql