LU-9073 gss: remove newer kernel support

LU-9073 gss: remove newer kernel support

Revert the work to support newer kernels for GSS. For now
disable GSS support for kernels newer than 4.6 so this
doesn't block people on newer distros. Even is very basic
support for GSS is restored I wouldn't recommend this for
production systems at this time.

Change-Id: I7e1636bf695e1686bbdf968d088fcfc5a8f8f062
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/27823
Tested-by: Jenkins
Reviewed-by: Chris Hanna <hannac@iu.edu>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>