Move boilerplate from hooks/ to hack/

Hooks seems like they should be hooks. Not sure hack makes a lot more
sense, but it has more stuff already.

hack/boilerplate/boilerplate.sh.txt

@@ -0,0 +1,14 @@
+# Copyright YEAR The Kubernetes 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.
+