This allows a response to an input with dport=`supevisor api port` and
is required when the host OS is doing stateful firewalling.
This should not affect things when stateful firewalling is not in
effect, as the standard OUTPUT chain policy is ACCEPT, so we're just
being explicit about it.
Change-type: patch
Backport-to: next, current, sunset
Signed-off-by: Cameron Diver <cameron@balena.io>