Add roles for gluster cluster

Adding role for Glusterfs in cluster in order to be able to
manage cluster based on roles and not on node names.

Change-Id: Ib790fd65113fa62e62ec3b3cf715bebdec95e06c
Related-Prod: https://mirantis.jira.com/browse/PROD-23104
diff --git a/glusterfs/server/cluster.yml b/glusterfs/server/cluster.yml
index 16453c9..f7c520e 100644
--- a/glusterfs/server/cluster.yml
+++ b/glusterfs/server/cluster.yml
@@ -8,6 +8,7 @@
       iptables:
         enabled: false
     server:
+      role: ${_param:glusterfs_node_role}
       peers:
       - ${_param:cluster_node01_address}
       - ${_param:cluster_node02_address}