hive: investigate devp2p/discv4 RlpTypeMismatch error

[jangko]

[8cf14ec1] /nimbus-eth1/nimbus/nimbus.nim(221) nimbus
[8cf14ec1] /nimbus-eth1/nimbus/nimbus.nim(63) start
[8cf14ec1] /nimbus-eth1/nimbus/conf_utils.nim(40) importRlpBlock
[8cf14ec1] /nimbus-eth1/vendor/nim-eth/eth/rlp.nim(379) readImpl
[8cf14ec1] /nimbus-eth1/vendor/nim-eth/eth/rlp.nim(354) readImpl
[8cf14ec1] /nimbus-eth1/vendor/nim-eth/eth/rlp.nim(379) readImpl
[8cf14ec1] /nimbus-eth1/vendor/nim-eth/eth/rlp.nim(291) readImpl
[8cf14ec1] /nimbus-eth1/vendor/nim-eth/eth/rlp.nim(189) toInt
[8cf14ec1] Error: unhandled exception: The RLP contains a larger than expected Int value [RlpTypeMismatch]

[jangko]

this error also appears in devp2p/eth and ethereum/sync

[jangko]

Turn out, the V value of Transaction in rlp encoded blocks is larger than 255.
It means they are using big ChainID. The reason for this error is our Transaction object is using byte for V.
Geth is taking it to the extreme, using BigInt. and Nimbus is on the other extreme, using only one byte.
We will solve this as part of EIP2930 implementation.

[jangko]

closing, fixed by #661