app/testpmd: distribute queues to cores

app/testpmd: distribute queues to cores

Current topology distribute forwarding streams to lcores by port, this
make unbalanced loading when port number larger than 2:
	lcore 0: P0Q0->P1Q0, P0Q1->P1Q1
	locre 1: P1Q0->P0Q0, P1Q1->P0Q1
If only one port has traffic, only one locre get fully loaded and the
other one get no forwarding. Performance is bad as only one core doing
forwarding in such case.

This patch distributes forwarding streams by queue, try to get streams
of each port handled by different lcore:
	lcore 0: P0Q0->P1Q0, P1Q0->P1Q0
	locre 1: P0Q1->P0Q1, P1Q1->P0Q1

Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>