Update Jenkins job configuration

* Set a different password for JJB on jenkins02
* Change Jenkins install package to install from Jenkins LTS repo.
  This is a more stable Jenkins release.
* Fix problem with Jenkins Apache reverse proxy setup
* Re-arranged Jenkins jobs plugin list to follow the order of the
  Jenkins plugins web page to make comparison easier.
* Updated the following plugins : build-timeout, envinject,
  gearman-plugin, parameterized-trigger, timestamper
* Added the following plugins : build-flow-plugin, conditional-buildstep,
  zmq-event-publisher, jenkins-multijob-plugin, xunit

blueprint infra-cloud-east-region

Change-Id: I728af519bc0cc91356d499f339eb664e9b48a564