Move hash bang to first line.
For hash bang statements to take effect, they must be the first line
in a script.
Fixes
+#!/bin/bash
+
# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# See the License for the specific language governing permissions and
# limitations under the License.
-#!/bin/bash
set -e
if [ $# -lt 3 ]; then
