staging: lustre: don't include libcfs.h in lnet/lib-lnet.h

We want to be more focused in what is included where.
So we remove libcfs.h from where it isn't needed.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>