Neutron's firewall initialization with OVS seems
to be the source of our pain with ports not being found
by ironic jobs. This is because firewall startup errors
crashes out the agent with a RuntimeError while it is deep
in it's initial __init__ sequence.
This ultimately seems to be rooted with communication
with OVS itself, but perhaps the easiest solution is
to just disable the firewall....
Related: https://bugs.launchpad.net/neutron/+bug/1944201
Change-Id: I303989a825a7e35f1cb7b401134fd63553f6791c
8e173b88d1