LU-2675 lnet: assume a kernel build

LU-2675 lnet: 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.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I79d6f50bac895116628c93c35e23f64dd102780f
Reviewed-on: http://review.whamcloud.com/13121
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>