Adds a configuration option [iptables]ip_version to specify the
desired ip version for the iptables pxe filter, which can be set to
4 or 6. When set to 6, the iptables pxe filter will use ip6tables
command to manage rules for the port 547 which is the port of DHCPv6
The string type is used to make room for the future, when there is need
to automatically determine ip version from the binding interface.
The dnsmasq pxe filter takes start/stop commands for the
dnsmasq service as options. Restarting the systemd service
requries root access.
This change adds a rootwrap filter to allow systemctl
control of the dnsmasq service.
NOTE: The systemd service name is the one used in the RDO
distribution. Additional filters may be needed for other