v1.1.1 spec updates (#2684)

* update initializing from eth1 for merge genesis

* read execution payload header from file lcli

* add `create-payload-header` command to `lcli`

* fix base fee parsing

* Apply suggestions from code review

* default `execution_payload_header` bool to false when deserializing `meta.yml` in EF tests

Co-authored-by: Paul Hauner <paul@paulhauner.com>

lcli/src/interop_genesis.rs

@@ -38,6 +38,7 @@ pub fn run<T: EthSpec>(testnet_dir: PathBuf, matches: &ArgMatches) -> Result<(),
         &keypairs,
         genesis_time,
         Hash256::from_slice(DEFAULT_ETH1_BLOCK_HASH),
+        None,
         &spec,
     )?;