MB-11803: Update last noop time on consumer when noop is received

Change-Id: I76f8fe2b38a722ee0382f0cc2cc9219225b9b980
Reviewed-on: http://review.couchbase.org/39760
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>