hings that I had to change so far:

* Allow non-logged in users to read jobs (not managed by puppet)

* Add a new credential for the lago deploy job (ssh to resources.ovirt.org as
  lago-deploy-snapshot user, not in puppet, using private key)

* Upgrade the ssh-agent plugin and restart jenkins, as it was not pulling
  correctly the upgraded plugin just by 'reloading'
  https://gerrit.ovirt.org/#/c/55722/

btw. the jenkins host is currently failing to run puppet (it's using testing
env), so I was unable to actually verify any patches, as I did not want to mess
up any on-going tests