Now the rdma core offers a QP draining service in v4.6-rc1,
use it instead of our own.
Signed-off-by: NSagi Grimberg <sagig@mellanox.com>
Reported-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>