Set auth_type to password

auth_type should be set to password in cluster by default

Change-Id: I756fc92ee5924a82326913a47496c48f0259baf1
diff --git a/metadata/service/server/cluster.yml b/metadata/service/server/cluster.yml
index 0303fae..43ec445 100644
--- a/metadata/service/server/cluster.yml
+++ b/metadata/service/server/cluster.yml
@@ -19,4 +19,5 @@
         private_port: 5000
         user: gnocchi
         password: ${_param:keystone_gnocchi_password}
-        tenant: service
\ No newline at end of file
+        tenant: service
+        auth_type: password
\ No newline at end of file