Enable multi-port perf in trex as TG

Enable multi-port perf in trex as TG

set TRex -c option for threads per port based on
hardware number of queues.

We can't auto-detect number of queues and we can't
use more than one thread per core on systems with single-queue
interfaces, so move the option to the config file

options:
  tg_0:
    queues_per_port: 2

also enable trex debug by removing >/dev/null redirection

options:
  tg_0:
    trex_server_debug: true

Change-Id: I46da187849282bf28f4ef5b333e1ae890e202768
Signed-off-by: Deepak S <deepak.s@linux.intel.com>
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>