Requeue jobs if AnsibleHostUnreachable return
Requeue jobs if AnsibleHostUnreachable return

If ansible-playbook return AnsibleHostUnreachable (3), we can assume
there was a network issue runing our playbook. Rather then continuing
and potentially posting no logs, we can have zuul requeue the job to
try again.

Change-Id: I8c4d92fa7156c7d8591ca5b54be8cb30c249eacf
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

gooddata/zuul,gooddata/zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,gooddata/zuul,gooddata/zuul,gooddata/zuul,wikimedia/integration-zuul,wikimedia/integration-zuul