Add license headers to all go and shell files

Test: none
Change-Id: I75c443e05f2b1e17fcb6823182717d2e6f5df7c4

bootstrap.bash

@@ -1,5 +1,19 @@
 #!/bin/bash
 
+# Copyright 2017 Google Inc. 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.
+
 echo '==== ERROR: bootstrap.bash & ./soong are obsolete ====' >&2
 echo 'Use `m --skip-make` with a standalone OUT_DIR instead.' >&2
 echo 'Without envsetup.sh, use:' >&2