Stream open should not be automatic.

[F483]

Currently when Alice requests to open a stream with Bob, Bob automatically accepts and returns the generated streamid.

This make all clients vulnerable to memory attacks. Instead there should be some mechanism where Bob must confirm the stream open and it quickly times out if he does not.

[F483]

It may be better to have a stream limit and just close the oldest or least active. This may be better for the following reasons.

• It keeps the interface simple.
• Doing otherwise would just defer the attack vector to the user. It would be better to do this once correctly in storjnet instead of requesting users to duplicate the effort (likely badly or not at all).