* Fix unexpected `UnrequestedBlobId` and `ExtraBlocksReturned` errors due to race conditions.
* Continue chain segment processing and skip any blocks that are already known, rather than returning an error.
* more de-dup checking
* ensure we don't reset `requested_ids` during rpc download
* better fix
* Merge branch 'unstable' of https://github.com/sigp/lighthouse into more-dup-lookup-fixes
* remove chain hash check
* Merge branch 'fix-block-lookup-race' of https://github.com/jimmygchen/lighthouse into sean-test-lookups
* remove block check
* add back tests
* Log and CI fixes
* undue extra check
* Merge branch 'sean-test-lookups' of https://github.com/realbigsean/lighthouse into sean-test-lookups
* log improvements
* Improve logging
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