Added help to gnocchi collector options

When re-creating the keystoneauth opts in the gnocchi collector
in order to add the deprecated group, the "help" argument was omitted,
leading to an uncommented option when generating the config file.

Change-Id: Ib4e46c3d5575361baa7313e00e7b3542370d05b7

cloudkitty/collector/gnocchi.py

@@ -41,6 +41,7 @@ keystone_opts = [
     cfg.Opt(
         o.name,
         type=o.type,
+        help=o.help,
         deprecated_group=DEPRECATED_COLLECTOR_GNOCCHI_OPTS,
     ) for o in keystone_opts
 ]