Non-blocking connect

[mp]

Thanks Roy. I was just trying to understand someone else's code, but
in the end it turns out that this was just a bug.

What weirded me out was how injecting a print statement preventing the
error from occurring, but now I get it. Without blocking, the
connection handshake occurs in parallel after the connect_exc method
is called. In my example, my processor reaches the send call before
the connection manages to complete in the background. However, if you
stick in a print statement after the connect_exc call and before the
send call, it delays processing just long enough for the connection to
complete, thus no exception is thrown by the send call.