net/i40e: fix queue pairs configuration in VF

net/i40e: fix queue pairs configuration in VF

If a VF request PF to allocate more number of queue pairs, the PF will
free the queue pairs which have been allocated and reset the VF. So,
VF should stop to work until all the process is done. This patch modify
the process of the request queue pairs. To improve efficiency and
eliminate code redundancy, the promiscuous ops were also updated.

Fixes: c48eb308ed13 ("net/i40e: support VF request more queues")
Cc: stable@dpdk.org
Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
Acked-by: Jeff Guo <jia.guo@intel.com>