LU-250 lnet: Router random shuffling support

LU-250 lnet: Router random shuffling support

This is the last of the router improvements that where
developed at ORNL. This feature allows routes to be
randomly placed. Our results show a 20 percent
improvement with random shuffling.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I6862febebd6797fb35c003646f6d90f5d5d2b014
Reviewed-on: http://review.whamcloud.com/249
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Isaac Huang <Isaac_Huang@xyratex.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>