During review of the upstream training slides is was decided
that the existing detailed overview of Jenkins was not as
helpful. We decided to generalize the topic a bit to talk
about Zuul and the different types of gates.
This patch removes the old content and renames the slides
accordingly. The content now introduces status.openstack.org ,
explains Zuul and the different pipelines. Talks about how to
find logs and investigate elastic-recheck failures. As with
other updates things have are more exercise focused.
Change-Id: If527a57ee3874aa0168d08f093937970f90b1d10
82f8a33182