DPDK: fix low performance of SR-IOV VF IO lcore
DPDK: fix low performance of SR-IOV VF IO lcore

The check for number of forwarding lcores is incorrect when
number of worwarding lcores is about the same the number of
TX queues.

Change-Id: Icd4e2fe453e695199322fb5391aebf5cd2ffed3b
Closes-bug: #1567470

codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter