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
+}

contrib/network-storage/heketi/roles/provision/templates/storageclass.yml.j2

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+---
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: gluster
+provisioner: kubernetes.io/glusterfs
+parameters:
+  resturl: "http://{{ endpoint_address }}:8080"
+  restuser: "user"
+  restuserkey: "{{ heketi_user_key }}"

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

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+{
+  "clusters": [
+    {
+      "nodes": [
+{% set nodeblocks = [] %}
+{% for node in nodes %}
+{% set nodeblock %}
+        {
+          "node": {
+            "hostnames": {
+              "manage": [
+                "{{ node }}"
+              ],
+              "storage": [
+                "{{ hostvars[node]['ansible_facts']['default_ipv4']['address'] }}"
+              ]
+            },
+            "zone": 1
+          },
+          "devices": [
+            {
+              "name": "{{ hostvars[node]['disk_volume_device_1'] }}",
+              "destroydata": false
+            }
+          ]
+        }
+{% endset %}
+{% if nodeblocks.append(nodeblock) %}{% endif %}
+{% endfor %}
+{{ nodeblocks|join(',') }}
+      ]
+    }
+  ]
+}