MB-10514: Send stream end immediately if start/end seqno's are the same

Change-Id: Icd098f536586a7153de0722d854283892e42c038
Reviewed-on: http://review.couchbase.org/34912
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: buildbot <build@couchbase.com>