netdev-dpdk: Pass queue id to dpdk_do_tx_copy().

Since dpdk_do_tx_copy() will be called by both pmd and
non-pmd thread, it should take the queue id as input.
The current ovs always uses NON_PMD_THREAD_TX_QUEUE
as queue id, which causes unprotected multi-access
to the same queue.

This commit fixes the issue by passing the queue id
to dpdk_do_tx_copy().

Reported-by: Ethan Jackson <ethan@nicira.com>
Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Daniele Di Proietto <ddiproietto@vmware.com>