[Merged by Bors] - Update ENR construction and mainnet bootnodes #1968
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Issue Addressed
Boot nodes were being successfully created and publishing valid ENRs however the
eth2field was not being saved to disk leading to a discrepancy between published ENR and disk ENR.If the
eth2field is known, it is now constructed in the initial ENR and saved to disk.Previous mainnet bootnodes did not contain the
eth2field and these have also been updated.