Add --set_current_tld_state to UpdateTldCommand

This feature would have been useful earlier when I was changing the TLD
state on a sandbox TLD on-the-fly for testing purposes.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=128088578

java/google/registry/tools/sql/billing_data_view.sql

@@ -1,3 +1,17 @@
+-- Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
 -- Billing Data View SQL
 --
 -- This query post-processes the OneTime billing events, combines them with