Real cleanup if tunnel is closed.

[AZAZ78]

Solves problem with frequent connect and close of tunnel. I use this component (many thanks for it ;-)) e.g. in mycroft and weewx and there the tunnel is not open all the time but only if archive is written or a language command is invoked. Only the first connect works as expected. After close and a new connect the tunnel is not established working any more.

Feel free to contact me on gitter if you have any questions.