staging: lustre: assume a kernel build

In lnet/lnet/ and lnet/selftest/ assume a kernel build (assume that
 __KERNEL__ is defined). Remove some common code only needed for user
space LNet.

Only part of the work of this patch got merged. This is the final
bits.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2675
Reviewed-on: http://review.whamcloud.com/13121


Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>