Add license boilerplate to Vagrantfile

Change-Id: I64049d4598870f6a6e95f2dbb3b31f4b9dd69051
(cherry picked from commit 43dd3cb)

Vagrantfile

@@ -1,3 +1,15 @@
+# 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.
+
 Vagrant.configure(2) do |config|
   config.vm.box = "ubuntu/xenial64"
   config.vm.provider "virtualbox" do |v|