Add glusterfs backend support

This patch allows to configure glusterfs backend options
by this formula.

Change-Id: Ib13a677b366cedb838103423d1481a0db44e4be2
diff --git a/tests/pillar/share_glusterfs.sls b/tests/pillar/share_glusterfs.sls
new file mode 100644
index 0000000..41a9526
--- /dev/null
+++ b/tests/pillar/share_glusterfs.sls
@@ -0,0 +1,86 @@
+manila:
+  common:
+    identity:
+      engine: keystone
+      host: 127.0.0.1
+      port: 35357
+      tenant: service
+      user: manila
+      password: misterio
+      endpoint_type: internalURL
+    database:
+      engine: mysql
+      host: 127.0.0.1
+      port: 3306
+      name: manila
+      user: manila
+      password: misterio
+    message_queue:
+      engine: rabbitmq
+      host: '127.0.0.1'
+      port: 5672
+      user: openstack
+      password: workshop
+      virtual_host: '/openstack'
+  share:
+    version: pike
+    enabled: true
+    enabled_share_backends:
+      glusterfs:
+        name: glusterfs
+        type: glusterfs
+        enabled: true
+        share_driver: manila.share.drivers.glusterfs_native.GlusterfsNativeShareDriver
+        dhss: false
+        glusterfs_ganesha_server_ip: 1.2.3.4
+        glusterfs_ganesha_server_password: secretpassword
+        glusterfs_ganesha_server_username: nonexistent
+        glusterfs_mount_point_base: state_path/mnt
+        glusterfs_server_password: secretpassword
+        glusterfs_path_to_private_key: /path/to/key
+        glusterfs_nfs_server_type: glusterfs
+        glusterfs_share_layout: share_layout
+        glusterfs_target: remove:target
+        glusterfs_servers:
+          - server1
+          - server2
+        glusterfs_volume_pattern: manila-share-volume-d+$
+apache:
+  server:
+    enabled: true
+    default_mpm: event
+    mpm:
+      prefork:
+        enabled: true
+        servers:
+          start: 5
+          spare:
+            min: 2
+            max: 10
+        max_requests: 0
+        max_clients: 20
+        limit: 20
+    site:
+      manila:
+        enabled: false
+        available: true
+        type: wsgi
+        name: manila
+        host:
+          name: manila.ci.local
+          address: 127.0.0.1
+          port: 8041
+        log:
+          custom:
+            format: >-
+              %v:%p %{X-Forwarded-For}i %h %l %u %t \"%r\" %>s %D %O \"%{Referer}i\" \"%{User-Agent}i\"
+        wsgi:
+          daemon_process: manila-api
+          processes: 2
+          threads: 10
+          user: manila
+          group: manila
+          display_name: '%{GROUP}'
+          script_alias: '/ /usr/bin/manila-api'
+          application_group: '%{GLOBAL}'
+          authorization: 'On'