stop randomizing pool details nodes

There's no need for it.

Change-Id: I40cbb06a9d1edaed7787eb3885f7739c267e931c
Reviewed-on: http://review.couchbase.org/35215
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>