It's the only part of base that's important to run when we run a
service. Run it in the service playbooks and get rid of the
dependency on infra-prod-base.
Continue running it in base so that new nodes are brought up
with iptables in place.
Bump the timeout for the mirror job, because the iptables addition
seems to have just bumped it over the edge.
Upstream likes building the settings file into the image, but that's
less exciting, let's bind-mount ours in.