MB-9715: Fixed the upr api to allow for "pause"

Change-Id: I1ff3331c62b1d3c02b85bed7a76dcc4c4c2910c8
Reviewed-on: http://review.couchbase.org/33480
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>