Rename get_or_add_user_role

get_or_add_user_role is specific to adding a role on a project.
Rename it to get_or_add_user_project_role to allow room for adding a
domain specific role function.

Change-Id: I999308098d22be9800578ae67144a3b687fbc3be
diff --git a/lib/ceilometer b/lib/ceilometer
index f03bab2..c449ad2 100644
--- a/lib/ceilometer
+++ b/lib/ceilometer
@@ -121,7 +121,7 @@
         fi
         if is_service_enabled swift; then
             # Ceilometer needs ResellerAdmin role to access swift account stats.
-            get_or_add_user_role "ResellerAdmin" "ceilometer" $SERVICE_TENANT_NAME
+            get_or_add_user_project_role "ResellerAdmin" "ceilometer" $SERVICE_TENANT_NAME
         fi
     fi
 }