Zuul 3.7.0 introduced a breaking configuration change, we now need to
define zookeeper hosts by default.
Disable 306 for ansible-lint until we can decided best fix.
Change-Id: Idd54f1ea75cccbb0dab7978ca4d7778fbc05bf42
Signed-off-by: Paul Belanger <pabelanger@redhat.com>