Enhance Buckets with GetRandomDoc() method to get a random doc from the bucket.
Enhance Buckets with GetRandomDoc() method to get a random doc from the bucket.

Change-Id: I07c58a04de1125352b5703d9e751bb569461095a
Reviewed-on: http://review.couchbase.org/59674
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Reviewed-by: Eben Haber <d1abc94d70526bfcf3e4b0ce727cb9a6fbb52a3a@couchbase.com>
Tested-by: Eben Haber <d1abc94d70526bfcf3e4b0ce727cb9a6fbb52a3a@couchbase.com>

couchbase/go-couchbase