LU-6245 libcfs: remove linux-utils.c

The source file linux-utils.c contains only empty
functions of features that were never implemented.
We can delete this unused code.

Change-Id: Id5820a94d15b055096544120fb14b987604e733c
Signed-off-by: frank zago <fzago@cray.com>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: http://review.whamcloud.com/15910
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>