Add support to define ipv4 and ipv6 forwarding tables
from reading from a config file for EM with a format
similar to l3fwd-acl one.
Users can now use the default hardcoded route tables
or optionally config files for 'l3fwd_em'. Default
config files have been provided for use with EM.
Related l3fwd docs have been updated to reflect these
changes.
Signed-off-by: Sean Morrissey <sean.morrissey@intel.com> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>