main/iptables: add netns support
Background: openrc got patched to support running services in netns namespaces !51670 (merged)
This MR adds netns support for the (ip|eb)tables initd scripts.
Example /etc/conf.d/iptables.tenant1
:
# enable netns support
netns=tenant1
# Location in which iptables initscript will save set rules on
# service shutdown
IPTABLES_SAVE="/etc/iptables/rules-tenant1"
# [..]