Mr-laforge

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* Fix import of controllerplugin for Python 3.x.
[fschulze]

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* Fix ``do_kill`` for Python 3.x.
[fschulze]

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* Add Python 3.x support.
[fschulze]

* Add timeout to socket, so we don't hang on unavailable hosts.
[fschulze]

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* Added ``supervisordown`` script and matching ``down`` method to make sure a
process is stopped.
[fschulze]

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* Allow setting supervisor arguments via the ``MR_LAFORGE_SUPERVISOR_ARGS``
environment variable.
[witsch]

* Added ``shutdown`` function to shutdown supervisord from Python code.
[fschulze]

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* Added waitforports script and function to wait until a process is listening
on specified ports.
[fschulze, witsch]