Issue a timeout even if messages have arrived
Issue a timeout even if messages have arrived

When processing _changes feeds a timeout message simply generates a
newline in the response body.  We can afford to send a few extra of
those.  This patch allows us to send messages from the workers back to
the coordinator without interfering with the timeout calculation.

BugzID: 17709

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb