Remove iptables from packages

Podman 6.0 won't support iptables anymore. It's a
good opportunity to remove iptables from machine-os
too. iptables kernel modules are kept to avoid
breaking containers that requires them (e.g. docker
in docker).

This is a follow-up of

containers/netavark#1353
containers/podman#27555

and related to

https://issues.redhat.com/browse/RUN-3723

Signed-off-by: Mario Loriedo <[email protected]>

Author: l0rd

podman-image/build_common.sh

@@ -99,7 +99,6 @@ PACKAGES=(
     openssh-server
     cifs-utils
     nfs-utils-coreos
-    iptables-nft
     iproute
     dhcp-client
 

podman-image/podman-iptables.conf

@@ -4,8 +4,8 @@
 # still need it, i.e. nested docker or older podman.
 # Normally it would be up to the sys admin to configure this but given
 # podman machine os is more of "managed" OS we should just keep it to
-# avoid breaking users, https://github.com/containers/podman/issues/25153.
-# TODO (6.0): consider removing this in a major release where we can justify
-# removing legacy modules.
+# avoid breaking users:
+# - https://github.com/containers/podman/issues/25153.
+# - https://github.com/containers/podman-machine-os/pull/197#issuecomment-3558043836
 ip_tables
 ip6_tables