Update to latest libp2p via downgrading libp2p to tokio 0.2 #1924
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Description
Despite significant effort, I don't think we can get to tokio 0.3 ourselves and will have to wait for the hyper and warp ecosystem to update themselves. Latest libp2p panics unless we are running a tokio 0.3 executor.
This PR brings us to the latest libp2p by downgrading the latest libp2p back to tokio 0.2 to run with our current executor.
We will have to hold lighthouse at tokio 0.2 until hyper and warp and all our associated deps that depend on hyper and warp (i.e reqwest) have also updated.