avoid printing exceptions (traceback.print_exc)

[progrium]

avoid printing exceptions (traceback.print_exc)

[ryanlarrabure]

We should consider logging the exception instead of printing it. It will make debugging and testing easier.

[progrium]

Alan suggests we have two options: swallowing it or aborting (just die). Service.stop() should not raise. If it did, it's the Service implementor's fault.

[progrium]

Okay, we know that Service.stop() should not call Service.do_stop() if the service is not started, but should call stop() on its children.

We also decided to remove the try...except inside start() (and serve_forever()) that will try to call stop() on an exception.

[progrium]

I think the latest master satisfies this. I remember this was a nebulous issue that got into a bunch of other issues... most of which seem to have been resolved after 0.5.0