Anton Kaliaev d12e55c494 node: Respond always to OS interrupts (#2479)
* stop node upon receiving SIGTERM or CTRL-Ceven during genesis sleep by setting up interrupt before starting a node

Closes #2434

* call Start, not OnStart when starting a component to avoid:

```
E[09-24|10:13:15.805] Not stopping PubSub -- have not been started yet module=pubsub impl=PubSub
```

being printed on exit
2018-09-25 12:24:18 +02:00
..