Disable intra-cluster replication flow control

This should be disabled temporarily in order to all qe to make
progress on testing while we debug an issue in flow control.

Change-Id: I37bfac8511c4380362ba870d4268f1653ff64526
Reviewed-on: http://review.couchbase.org/37000
Tested-by: Michael Wiederhold <mike@couchbase.com>
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>