Build Gerrit v2.9 for older setups

There are still companies using Gerrit v2.9 in production
and they may need ad-hoc fixes, even if we are not going to
release any further official patch-release.

Change-Id: I89c3fe5ce5b9cea5f4d1736950934c7782e2ff94
2 files changed
tree: 07dbc2c660a711d9a8a7cab59c3c3abda71214b0
  1. jenkins/
  2. jenkins-docker/
  3. .gitignore