LU-6490 gss: handle struct key_type match replacement

LU-6490 gss: handle struct key_type match replacement

Starting with the 3.17 kernel the function match
used by struct key_type was replaced by a new
function match_preparse. This patch added support
for this change.

Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Change-Id: I2db0860cf089b0ba8f70bad9155f48e52ec8c4b5
Reviewed-on: http://review.whamcloud.com/15804
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sebastien Buisson <sebastien.buisson@bull.net>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>