Update Jenkins to 2.60.3

The Jenkins version was still at 2.25.

In the process of updating to the current LTS, this change updates
Jenkins to 2.60.3, which is the last version supporting the build
flow plugin, while supporting pipelines. This version can be used
to convert build flow jobs to pipeline jobs, before updating
further.

Change-Id: I89cfad6e0b5edfb8cdde1f2b3cd342c4de9bddc7
5 files changed
tree: f33b92239f9119feee98f47631e616bd94555ece
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore