add heketi/glusterfs as additional contributional network storage

contrib/network-storage/heketi/roles/provision/templates/heketi.json.j2

@@ -0,0 +1,44 @@
+{
+  "_port_comment": "Heketi Server Port Number",
+  "port": "8080",
+
+  "_use_auth": "Enable JWT authorization. Please enable for deployment",
+  "use_auth": false,
+
+  "_jwt": "Private keys for access",
+  "jwt": {
+    "_admin": "Admin has access to all APIs",
+    "admin": {
+      "key": "{{ heketi_admin_key }}"
+    },
+    "_user": "User only has access to /volumes endpoint",
+    "user": {
+      "key": "{{ heketi_user_key }}"
+    }
+  },
+
+  "_glusterfs_comment": "GlusterFS Configuration",
+  "glusterfs": {
+    "_executor_comment": "Execute plugin. Possible choices: mock, kubernetes, ssh",
+    "executor": "kubernetes",
+
+    "_db_comment": "Database file name",
+    "db": "/var/lib/heketi/heketi.db",
+
+    "kubeexec": {
+      "rebalance_on_expansion": true
+    },
+
+    "sshexec": {
+      "rebalance_on_expansion": true,
+      "keyfile": "/etc/heketi/private_key",
+      "fstab": "/etc/fstab",
+      "port": "22",
+      "user": "root",
+      "sudo": false
+    }
+  },
+
+  "_backup_db_to_kube_secret": "Backup the heketi database to a Kubernetes secret when running in Kubernetes. Default is off.",
+  "backup_db_to_kube_secret": false
+}