Check we don't have a race condition in bin/ethlambda/src/main.rs

[pablodeymo]

In bin/ethlambda/src/main.rs we have:

    // Wire actors together via protocol refs
    let _ = blockchain.actor_ref().recipient::<InitP2P>().send(InitP2P {
        p2p: p2p.actor_ref().to_block_chain_to_p2p_ref(),
    });
    let _ = p2p
        .actor_ref()
        .recipient::<InitBlockChain>()
        .send(InitBlockChain {
            blockchain: blockchain.actor_ref().to_p2p_to_block_chain_ref(),
        });

We have to make sure we don't have a race condition between these 2 calls.