Docker Networking and Packaging Improvements

- Better selection of DNS server (with systemd) [moby/moby#41022](https://github.com/moby/moby/pull/41022) - Add docker interfaces to firewalld docker zone [moby/moby#41189](https://github.com/moby/moby/pull/41189) [moby/libnetwork#2548](https://github.com/moby/libnetwork/pull/2548) - Fixes DNS issue on CentOS8 [docker/for-linux#957](https://github.com/docker/for-linux/issues/957) - Fixes Port Forwarding on RHEL 8 with Firewalld running with FirewallBackend=nftables [moby/libnetwork#2496](https://github.com/moby/libnetwork/issues/2496) - Fix an issue reporting 'failed to get network during CreateEndpoint' [moby/moby#41189](https://github.com/moby/moby/pull/41189) [moby/libnetwork#2554](https://github.com/moby/libnetwork/pull/2554) - Log error instead of disabling IPv6 router advertisement failed [moby/moby#41189](https://github.com/moby/moby/pull/41189) [moby/libnetwork#2563](https://github.com/moby/libnetwork/pull/2563) - No longer ignore `--default-address-pool` option in certain cases [moby/moby#40711](https://github.com/moby/moby/pull/40711) - Produce an error with invalid address pool [moby/moby#40808](https://github.com/moby/moby/pull/40808) [moby/libnetwork#2538](https://github.com/moby/libnetwork/pull/2538) - Fix `DOCKER-USER` chain not created when IPTableEnable=false [moby/moby#40808](https://github.com/moby/moby/pull/40808) [moby/libnetwork#2471](https://github.com/moby/libnetwork/pull/2471) - Fix panic on startup in systemd environments [moby/moby#40808](https://github.com/moby/moby/pull/40808) [moby/libnetwork#2544](https://github.com/moby/libnetwork/pull/2544) - Fix issue preventing containers to communicate over macvlan internal network [moby/moby#40596](https://github.com/moby/moby/pull/40596) [moby/libnetwork#2407](https://github.com/moby/libnetwork/pull/2407) - Fix InhibitIPv4 nil panic [moby/moby#40596](https://github.com/moby/moby/pull/40596) - Fix VFP leak in Windows overlay network deletion [moby/moby#40596](https://github.com/moby/moby/pull/40596) [moby/libnetwork#2524](https://github.com/moby/libnetwork/pull/2524) ### Packaging - docker.service: Add multi-user.target to After= in unit file [moby/moby#41297](https://github.com/moby/moby/pull/41297) - docker.service: Allow socket activation [moby/moby#37470](https://github.com/moby/moby/pull/37470) - seccomp: Remove dependency in dockerd on libseccomp [moby/moby#41395](https://github.com/moby/moby/pull/41395)

This section details enhancements and fixes in Docker's networking and packaging areas. Networking improvements include better DNS server selection with systemd, integration with firewalld for Docker interfaces, and fixes for issues related to network creation, IPv6 router advertisement, address pool handling, and container communication over macvlan networks. Packaging updates involve modifications to the docker.service unit file, allowing socket activation, and removing the dependency on libseccomp in dockerd.