LU-1419 lnet: Add support for Cray's Gemini interconnect

LU-1419 lnet: Add support for Cray's Gemini interconnect

This patch adds LNET support to use Cray's Gemini
interconnect on their newer systems. The gnilnd was
originally based off of the ralnd.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Signed-off-by: Chris Horn <hornc@cray.com>
Signed-off-by: Cory Spitz <spitzcor@cray.com>
Change-Id: Ia98a44f4f3d68773438d820c49fe554a3d551dc5
Reviewed-on: http://review.whamcloud.com/3381
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Isaac Huang <he.huang@intel.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>