fix unit test
fix unit test

* previously two replicators with same configs were created, both pushPull. which is not a usual practice.
* Updated to make one push and another pull replicator. ]

couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios