Add license to reindexer script

Change-Id: Ic3a7141a0fd3cad9844942d0804baf38897af86e

admin/reindexer-1.0.groovy

diff --git a/admin/reindexer-1.0.groovy b/admin/reindexer-1.0.groovy
index 00cd0be..5c32773 100644
--- a/admin/reindexer-1.0.groovy
+++ b/admin/reindexer-1.0.groovy
@@ -1,3 +1,17 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.
+
 import com.google.gerrit.sshd.*
 import com.google.gerrit.extensions.annotations.*
 import com.google.gerrit.lucene.*