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ip*tables.service improvements

- WantedBy=basic.target with DefaultDependencies=yes (implicit default) is broken config. Use WantedBy=multi-user.target (like firewalld, NetworkManager).
  See https://lists.freedesktop.org/archives/systemd-devel/2016-July/037242.html

- After=syslog.target is unnecessary. It is not even provided since systemd 198. Remove it.
  See https://github.com/systemd/systemd/commit/5d4caf565471ff3401bd9b53aa814c8545a18a93

- systemd 214+ has a passive target designed for firewalls: network-pre.target. Add Before=network-pre.target / Wants=network-pre.target into [Unit] section.
  See https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/

One more thing. iptables.service has Before=ip6tables.service and ip6tables.service has After=iptables.service. This is redundant and can be simplified dropping one of them (I would remove Before=ip6tables.service from iptables.service, keeping After=iptables.service in ip6tables.service). Note: entirely optional.

Hi,

Thanks for your unit file review and the suggested improvements. Given that the
service works fine just the way it is, I'll treat this as an enhancement and
move the ticket to RHEL8. Feel free to speak up in case the unit is problematic
for you in RHEL7, i.e., there is something we should fix.

Thanks, Phil

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (iptables bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4518