Support running handler parametrized by name.

lib/ansible/playbook/__init__.py

@@ -544,10 +544,12 @@ class PlayBook(object):
                         for handler in play.handlers():
                             if len(handler.notified_by) > 0:
                                 self.inventory.restrict_to(handler.notified_by)
-                                if handler.name not in fired_names:
+                                # Resolve the variables first
+                                handler_name = template(play.basedir, handler.name, handler.module_vars)
+                                if handler_name not in fired_names:
                                     self._run_task(play, handler, True)
                                 # prevent duplicate handler includes from running more than once
-                                fired_names[handler.name] = 1
+                                fired_names[handler_name] = 1
                                 self.inventory.lift_restriction()
                                 new_list = handler.notified_by[:]
                                 for host in handler.notified_by: