[moblab] Improve the gitignore

BUG=None
TEST=None

Change-Id: I23f2d55d621fca7c13c828f5981ab002ca67f777
Reviewed-on: https://chromium-review.googlesource.com/1532529
Commit-Ready: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Matt Mallett <mattmallett@chromium.org>
1 file changed