* EIP 2124: Zero RTT netsplit on chain mismatch
* Assign number to EIP 2124
* Address review comments on EIP 2124.
* Rename EIP 2124 to better reflect content
* Fix cardinality
* Fix email address in 2124
* Update fork identifier EIP based on review discussions.
* Fixup EIP name for the fork identifier.
* Remove stale mention of ENR from forkid EIP.
* Add RLP encoding test cases for forkid EIP.
* Add Felix too to the forkid EIP author list.
* Get rid of mentioning the MTU stuffin the forkid EIP.
