Fix up license headers and Python linting

This will help [] be submitted without breaking the linter.
License headers are now added automatically where they were previously
added by hand. We're also now adding the license header to Soy and SQL
files.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129017424

java/google/registry/rde/XjcToContactResourceConverter.java

@@ -12,20 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// 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.
-
 package google.registry.rde;
 
 import com.google.common.base.Function;