TRex argument --dump-interfaces <list of PCI> (by default will take interfaces from...

TRex argument --dump-interfaces <list of PCI> (by default will take interfaces from /etc/trex_cfg.yaml if exists, if does not exists, will show all DPDK interfaces)
get interface speed from DPDK instead of using constants per driver
add script to generate config file /etc/trex_cfg.yaml: sudo ./dpdk_setup_ports.py -c <list of PCI>
show table of interfaces in sudo ./dpdk_setup_ports.py -t