* Use mounted volumes for data in geth nodes
* Use mounted volumes for data in lighthouse nodes
* Avoid resetting genesis time in a lighthouse node on restart
* Mount parent datadir for lighthouse nodes
* Trap signals on shutdown and clean up in lighthouse nodes
* Allow stalled sync in lighthouse beacon nodes
* Gracefully shutdown geth nodes
* Add clean up instructions
* Gracefully shutdown lighthouse boot node
Former-commit-id: 3130af161539c701e46b4ef8a8af5b503ce0433b
