MB-100: add xperf config for 1-to-1 replication

Change-Id: I9a643657657deb508eb9e3e17dd5a00e20d529ac
Reviewed-on: http://review.couchbase.org/25152
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>