gitignore: Ignore files from production servers.

To make git status and repo status more useful, ignore files
that are expected to exist on the production servers.

BUG=None
TEST=Manual check on real server.

Change-Id: Ia5cf8395f80cfb38d7e1f083a68da2d7707632f1
Reviewed-on: https://chromium-review.googlesource.com/223734
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Prashanth B <beeps@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
1 file changed