ZWave controller should be reset at start of program

[mrstegeman]

If the app crashes while the zwave dongle is inclusion mode, and you then restart the app, the dongle seems to still be in a state where many devices will timout. I observed that my Leviton devices all got timeouts.

Unplugging and replugging the dongle seemed to resolve this.

We might need to do a controller (dongle) reset. Ideally we'd detect the state that the controller is in and get it out of that state, and only reset the controller if absolutely required.

See also: WebThingsIO/gateway#74