Fixes a stem test failure; bugfix on c7ce6b98. Bug
not in any released Tor.

Missed in 667a6e8f.

Signed-off-by: David Goulet <dgoulet@torproject.org>

The main.c code is responsible for initialization and shutdown;
the mainloop.c code is responsible for running the main loop of Tor.

Splitting the "generic event loop" part of mainloop.c from the
event-loop-specific part is not done as part of this patch.

The parts for handling cell formats should be in src/core/or.

The parts for handling onionskin queues should be in src/core/or.

Only the crypto wrapper belongs in src/core/crypto.

See: https://bugs.torproject.org/4700

When sending the INTRODUCE1 cell, we acquire the needed data for the cell but
if the RP node_t has invalid data, we'll fail the send and completely kill the
SOCKS connection.

Instead, close the rendezvous circuit and return a transient error meaning
that Tor can recover by selecting a new rendezvous point. We'll also do the
same when we are unable to encode the INTRODUCE1 cell for which at that point,
we'll simply take another shot at a new rendezvous point.

Fixes #27774



Signed-off-by: David Goulet <dgoulet@torproject.org>

test_rebind.py actually does not require Python 3.

Bugfix on 5a11670f; bug not in any
Tor release.

See: https://bugs.torproject.org/4700

Fixes bug 27782; bugfix on 0.3.5.1-alpha

Related to #27795 -- since NSS will close the socket, we must not
count it as owned by Tor.