LU-6261 gnilnd: Add pkey module parameter

LU-6261 gnilnd: Add pkey module parameter

lustre:19561 changed the pkey to the value reserved in gni_pub.h and
the max_immediate size. These need to be the same on both the service
and compute nodes for gnilnd to establish a connection.
Add the module parameter pkey so that a node running a dev version of
software will be able to connect to a node running an older version
with appropriate changes to modprobe.conf.
With this change, add the following parameters to
IMAGE_PATH/compute/etc/modprobe.conf:

options kgnilnd max_immediate=2048
options kgnilnd pkey=0xa3579

Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I08ea2d66e745c37f41931a53e599bc572664dd9a
Reviewed-on: http://review.whamcloud.com/15433
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: James Shimek <jshimek@cray.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>