MB-7074: add config with 16 replicators

Change-Id: I257d6b3b59ba448e3158d9b0c015810172addfe9
Reviewed-on: http://review.couchbase.org/24507
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>