MB-11421: Supports ack should be false for upr connections

Upr doesn't support ack/nack logic.

Change-Id: I5ba3d1cf323f527ce59ed2d8dd901566f3bcd1f5
Reviewed-on: http://review.couchbase.org/38347
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Reviewed-by: Sundararaman Sridharan <sundar@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>