MB-9343 sort partitions in upr_consumer_conn state

...because the callers rely on it

Change-Id: I30f051bf1db4290bef08b65a1d278ca1efafba8b
Reviewed-on: http://review.couchbase.org/34131
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>