Add backup functionality for keystone credentials

Related-Prod: PROD-35496
Change-Id: I43d43fed30b54b0eee5f5a3ad4482126fca4472a
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index f056fb2..12d1785 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -1,6 +1,8 @@
 parameters:
   keystone:
     _support:
+      backupninja:
+        enabled: true
       collectd:
         enabled: true
       fluentd: