LU-1199 build: Remove ancient "nonfree" module support

Lustre doesn't have any "nonfree" kernel modules, and the code to
support "nonfree" was from 2005.  I think we can remove it now.

Change-Id: I790d170fabdc5cd6e4948f20ccca2a6bfdd1bc29
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/4408


Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>