Docker is manipulating iptables rules by default to provide network
isolation, and this might cause problems if the host already has an
iptables-based firewall.
This change introduces docker_disable_default_iptables_rules to
disable the iptables manipulation by putting "iptables: false" [1] to
daemon.json
For better defaults, this feature will be enabled by default in
Victoria.
[1] https://docs.docker.com/network/iptables/
Closes-Bug: #1849275
Change-Id: I165199fc98fb98f227f2a20284e1bab03ef65b5b