MB-100 correctly split replications between tap and upr replicators

1. fix the sort order for mixed tap/upr mode

2. don't need to execute split replications code if the repl_type
   is tap or upr

Change-Id: Ib3984d025f216bd1f4ec8a5efc42850b03ffd7b4
Reviewed-on: http://review.couchbase.org/34357
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>