Fix lint error in cmdlib

Was accidentally introduced by commit 912737ba.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

lib/cmdlib.py

@@ -4505,7 +4505,6 @@ class LUClusterSetParams(LogicalUnit):
                                      " because instance '%s' is using it." %
                                      (instance.disk_template, instance.name))
-
   def _SetVgName(self, feedback_fn):
     """Determines and sets the new volume group name.