Fix conflicting names

Change-Id: I6fa3ebf21a131ed95b61620817ac25645ae3d3b3
diff --git a/glusterfs/server/service.sls b/glusterfs/server/service.sls
index 1e39540..0d9ccae 100644
--- a/glusterfs/server/service.sls
+++ b/glusterfs/server/service.sls
@@ -15,9 +15,10 @@
 {%- if server.volumes is defined %}
 {%- for name, volume in server.volumes.iteritems() %}
 
-{{ volume.storage }}:
+gluster_volume_{{ volume.storage }}:
   file.directory:
-    - makedirs: true
+  - name: {{ volume.storage }}
+  - makedirs: true
 
 {%- endfor %}
 {%- endif %}