Make isJobRegistered for gearman optional

With openstack-infra we actually validate our jobs exist before
merging them into our zuul configuration. As a result, the
registration check in zuul is redundant.  So provide a way for the
check to be enable / disabled.

Change-Id: I06f2221770e04f958ce7ac4cfe8d5d92d7164cac
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
2 files changed