LU-709 build: remove old userspace-OSS configure

LU-709 build: remove old userspace-OSS configure

Remove the old and obsolete userspace-OSS configure options.  These
are not used anywhere in the code, and are not intended to be needed
any time in the near future.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I9b50dbd4f22ad07696be7b3a39cbf87ab5500c1e
Reviewed-on: http://review.whamcloud.com/4828
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Christopher J. Morrone <chris.morrone.llnl@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>