Quote group names in case of spaces

* gerritlib/gerrit.py(Gerrit.createGroup): Quote the group name in
the API call so that Gerrit won't get confused by spaces.

Change-Id: Iad7110bedc2b5b4090313fd70679f0552292a807

gerritlib/gerrit.py

@@ -187,7 +187,7 @@ class Gerrit(object):
             cmd = '%s --visible-to-all' % cmd
         if owner:
             cmd = '%s --owner %s' % (cmd, owner)
-        cmd = '%s %s' % (cmd, group)
+        cmd = '%s "%s"' % (cmd, group)
         out, err = self._ssh(cmd)
         return err