Pin mercurial plugin version

The newest version of the mercurial plugin was not compatible with
Jenkins 2.60.3.

Change-Id: I27961026a6bddbeac16137e1a8acf1316a5a720c
1 file changed
tree: 5b903809898d1c413dedf5a4c66190fae88a519b
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore