Rename prometheus glusterfs volume

Change-Id: I9a2127c5344ed3b5d81767c899271d983888210f
diff --git a/glusterfs/client/volume/prometheus.yml b/glusterfs/client/volume/prometheus.yml
index f8b2f3d..2b2b7db 100644
--- a/glusterfs/client/volume/prometheus.yml
+++ b/glusterfs/client/volume/prometheus.yml
@@ -4,7 +4,7 @@
   glusterfs:
     client:
       volumes:
-        prometheus-config:
-          path: /srv/volumes/prometheus-config
+        prometheus:
+          path: /srv/volumes/prometheus
           server: ${_param:prometheus_glusterfs_service_host}
           opts: 'defaults'