LU-6245 libcfs: remove libcfsutil.h

LU-6245 libcfs: remove libcfsutil.h

Remove libcfsutil.h, fixup some headers, rename
libcfs/util/libcfsutil_ioctl.h to libcfs/util/ioctl.h, remove
libcfs/util/platform.h, remove libcfs/util/util.c, do some other
stuff. With these changes libcfs.h can be removed from libcfs
userland library.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I23c0531cd1c50a652799ad807d506fda35b22b3b
Reviewed-on: http://review.whamcloud.com/14180
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: frank zago <fzago@cray.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>