Previously we always tried to stop discovery if it was enabled according to
configuration. Now we check if it was started, because it can be started separataly from
a node.
- Replace command line flags with `-c` config flag. Part of #1180
- Convert node config private keys to hex-encoded string versions.
- Remove `GenerateConfig` from library.
- Remove unused `FirebaseConfig` from library.
- Fix loading of `config/status-chain-genesis.json` in non-dev machines.
Remove `PendingSignRequests` queue from the sign module.
This closes#1027 by removing the pending sign requests queue dependency from the SendTransaction, SignMessage and Recover.
Dmitry Shulyak
Adam Babik
Pedro Pombeiro
Sebastian Delgado
Ivan Daniluk
Adrià Cidre