* Command=line options.
* Keep alive for the eth protocol.
* Wire up final pieces.
* No network when dark.
* Passive and dark mode work.
* Ensure all RPCs keep alive.
* Fix tests.
* Fix minor bug.
* Minor whitespace.
* Split out some of the sleep-state.
* Fix help text.
* reserved peers: lock them, use a hashset, and provide to networkcontext
* adding and removing reserved peer service API
* add NonReservedPeerMode, and setters in host
* setting non reserved mode, restriction accepted connections
* implement RPC apis
* fix deadlock
* fix rpc tests
