Fix Pushkin Notification service metadata

Change-Id: I7312b108f671fd2dff2b3b8fde30ff703fe676bc
diff --git a/glusterfs/client/volume/pushkin.yml b/glusterfs/client/volume/pushkin.yml
index 1853863..6191cb4 100644
--- a/glusterfs/client/volume/pushkin.yml
+++ b/glusterfs/client/volume/pushkin.yml
@@ -7,4 +7,4 @@
         pushkin:
           path: /srv/volumes/pushkin
           server: ${_param:pushkin_glusterfs_service_host}
-          opts: 'defaults'
+          opts: 'defaults'
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