Shutdown the driver in response to ZWave NODE_REMOVED events.
Shutdown the driver in response to ZWave NODE_REMOVED events.

Rationale: RPC layer doesn't allow us to re-add removed nodes.
So, rather than fixing or working around this limitation, we simply exit the driver process on the expectation
that it will be restarted.

This also simplifies the recovery of resources associated with the removed node.

ninjasphere/driver-go-zwave,ninjasphere/driver-go-zwave