Give temporary processes time to stop cleanly

Allow temporary processes to perform some final actions when shutting
down.  For example, moc_muc_room:terminate/3 fails to send 'unavailable'
presence to the room participants when killed immediately.

src/ejabberd_tmp_sup.erl

@@ -36,4 +36,4 @@ init(Module) ->
     {ok,
      {{simple_one_for_one, 10, 1},
       [{undefined, {Module, start_link, []}, temporary,
-	brutal_kill, worker, [Module]}]}}.
+	1000, worker, [Module]}]}}.