LU-2675 build: remove obsolete Kernelenv files

LU-2675 build: remove obsolete Kernelenv files

Remove the obsolete Kernelenv.{in,mk} files from libcfs/ and lnet/.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I778b00c3c4b315d9811f594d2b99457a83b696c7
Reviewed-on: http://review.whamcloud.com/13196
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>