LU-5102 utils: Look for modules in $LUSTRE/utils/.libs

This allows locally built lustre utils to look for files outside of
the normal libdir location, and thus be tested without a full install.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I0f3c3446ddc9aed3cf494c597f4c0a4c432478de
Reviewed-on: http://review.whamcloud.com/10468
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>