BUG/MEDIUM: stream-int: don't set SI_FL_WAIT_ROOM on CF_READ_DONTWAIT

With the previous connection model, when we purposely decided to stop
receiving in order to avoid polling after a complete request was received
for example, it was needed to set SI_FL_WAIT_ROOM to prevent receive
polling from being re-armed. Now with the new subscription-based model
there is no such thing anymore and there is noone to remove this flag
either. Thus if a request takes more than one packet to come in or
spans over too many packets, this flag will cause it to wait forever.
Let's simply remove this flag now.

This patch should not be backported since older versions still need
that this flag is set here to stop receiving.
1 file changed