This changes adds 'nat' table in iptables. The netfilter side
is already configured for NAT but iptables config was missing.
Further, CONFIG_IP_NF_TARGET* configured below depend on
CONFIG_IP_NF_NAT but remain disabled unless CONFIG_IP_NF_NAT
is explicitly enabled.
CONFIG_IP_NF_TARGET_MASQUERADE is needed by Connman to
support tethering.
Signed-off-by: Mikko Ylinen <mikko.ylinen@linux.intel.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
