Build the gitiles plugin on its own branch

The gitiles plugin now has a stable-2.16 branch. Build it
separately for stable-2.16 and master.

Change-Id: I55291bc19163faad70961e6e1eeb0368d4a24f16
1 file changed
tree: afe944f2270380bc43e6b91ff303b33be72d68d2
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore