Philip Withnall authored Jan 21, 2014 and Olivier Crête committed Jan 31, 2014

If pseudo-TCP messages are received before a socket has been selected
from all the STUN candidates, they would previously be immediately
passed to the pseudo-TCP state machine, which would attempt to send ACKs
for them. This would fail (due to a lack of an outbound UDP socket), and
would incur a retransmit timeout in the TCP state machine. This slowed
down the tests enormously if one agent in a test completed candidate
selection before the other (which is an entirely reasonable scenario).

This never occurred before because the existing tests artificially run
both agents in lock-step, and never send data packets from one to the
other until both have completed candidate selection. This is basically
cheating.

Fix the problem by queuing incoming pseudo-TCP messages until an
outbound UDP socket is available to send the ACKs or SYNACKs on.