Fix application version on manila-ganesha charm

The charm is not using `version_package` in the class and it's
using the default to the first in packages which is Ceph.

Closes-bug: #2060751
Change-Id: Id745140a316120e56948f3770f2b2473d1134255
(cherry picked from commit 66f6413)

src/lib/charm/openstack/manila_ganesha.py

@@ -210,7 +210,7 @@ class ManilaGaneshaCharm(charms_openstack.charm.HAOpenStackCharm,
         # 'manila-share',
     ]
     ha_resources = ['vips', 'dnsha']
-    release_pkg = 'manila-common'
+    version_package = release_pkg = 'manila-common'
 
     package_codenames = {
         'manila-common': collections.OrderedDict([