LU-6215 lnet: split struct ib_send_wr

LU-6215 lnet: split struct ib_send_wr

In v4.4 Linux kernel split up struct ib_send_wr so that all non-trivial
verbs use their own structure which embeds struct ib_send_wr.

Linux-commit: e622f2f4ad2142d2a613a57fb85f8cf737935ef5
Change-Id: Iea2599ea57a576a4c061841be47a989aba097cc6
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: http://review.whamcloud.com/19168
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Li Dongyang <dongyang.li@anu.edu.au>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>