standardize file header wrt licensing

We've been slightly inconsistent in the license header in files.
Standardize them so we can automate checking.

Change-Id: I3cdf85c9485d33cac2bb05c8080dfada3e5a5e8d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/500102
Reviewed-by: Gavin Mak <gavinmak@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>

main.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-#
 # Copyright (C) 2008 The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");