Add support to define ipv4 and ipv6 forwarding tables
from reading from a config file for LPM and FIB,
with format similar to l3fwd-acl one.
Users can now use the default hardcoded route tables
or optionally config files. Default config files have
been provided for use with LPM and FIB.
Signed-off-by: Sean Morrissey <sean.morrissey@intel.com> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com> Tested-by: Yingya Han <yingyax.han@intel.com>