* fix "genesis hash does not match" when dev nodes connect
The "dev" nodes need to have the same --miner.etherbase in order to
generate the same genesis ExtraData by DeveloperGenesisBlock(). Override
DevnetEtherbase global var that's used if --miner.etherbase is not
passed. (for NonBlockProducer case)
* fix missing private key for the hardcoded DevnetEtherbase
Fixes panic if SigKey is not found. Bor non-producers will use a default
`DevnetEtherbase` while Dev nodes modify it. Save hardcoded
DevnetEtherbase/DevnetSignPrivateKey into accounts so that SigKey can
recover it.
* refactor devnet.node to contain Node config
This avoids interface{} type casts and fixes an error with
Heimdall.validatorSet == nil
* add connection retries to rpcCall and Subscribe of requestGenerator
Fixes "connection refused" errors due to node not ready to handle early
RPC requests.
* fix deadlock in Heimdall.NodeStarted
* fix GetBlockByNumber
Fixes "cannot unmarshal string into Go struct field body.transactions of
type jsonrpc.RPCTransaction"
* demote "no of blocks on childchain is less than confirmations
required" to Info (#8626)
* demote "mismatched pending subpool size" to Debug (#8615)
* revert wiggle testing code
