CCBC-433/CCBC-440 A new randomization algorithm.

Now using a Fisher–Yates shuffle to randomize the host list.

Change-Id: Ic9c8c862a4041b190b4c1ec0847f59a8b375ee9b
Reviewed-on: http://review.couchbase.org/37790
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>