RDMA/nes: Add support for IB_WR_*INV

Add support for IB_WR_SEND_WITH_INV, IB_WR_RDMA_READ_WITH_INV
and IB_WR_LOCAL_INV.

Signed-off-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>