[Twisted-Python] SSH Server with commands filtering

[Tzury Bar Yochay]

> Since execCommand is already only called in the reactor thread, this
> isn't doing much - but it is slightly changing the timing of when
> things happen.  That suggests the real problem may be a race between
> different parts of your code.  It's not obvious what the race might be
> between, from reading your code, though.
>
> Jean-Paul

I might even go bit further and do something that some twisteders will
consider nasty,
and have another thread for command processing so to split between the racers.

I appreciate your comments and the time you spent to read my code and messages.

Thanks again,
  Tzury