Skip validation for changes with merge conflicts

When a change is flagged by Gerrit as mergeable=false, there is no
value in starting a series of validation jobs because they would
eventually fail as well.

Change-Id: Ie63cefb43f333dcf588cbc70898541551ea5d93f
1 file changed
tree: 1477b8da02294fbcb1b4d9dc9541a24957f4105d
  1. jenkins/
  2. jenkins-docker/
  3. .gitignore