app/testpmd: separate forward config setup from display

app/testpmd: separate forward config setup from display

Add call to fwd_config_setup to init_config.
Add call to fwd_config_setup for corelist, coremask and nbcore setup.
Add call to fwd_config_setup for portlist, portmask and nbport setup.
Add call to fwd_config_setup for rxq, txq, rxd and txd setup.
Remove fwd_config_setup from fwd_config_display.
Call the pkt_fwd_config_display function directly,
and remove the fwd_config_display wrapper function.

Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>