All gerrit declarations should define a server

All gerrit declarations should define a server

Jobs that do not use our standard gerrit trigger declaration need to
define a specific gerrit server. If they do not then they can
potentially trigger on jobs from the OpenStack gerrit as well. We should
only be triggering on the OpenStack gerrit for well known and well
managed jobs or our CI will get disabled against OpenStack (again)

Change-Id: I8b742aa91f9247c5d900218cfdbb1ffbbc2463ec
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>