* eth1DataMajorityVote draft
* Merge branch 'origin-master' into eth1-majority-voting
* small test change
* move minimal config's HeadOfVotingPeriodLength closer to sqroot(32)
* remove todo
* remove head period and simplify equality check
* extract private functions from eth1DataMajorityVote
* feature flag
* Merge branch 'origin-master' into eth1-majority-voting
* add bytes import to tests
* Merge branch 'master' into eth1-majority-voting
* re-run build
* Merge branch 'master' into eth1-majority-voting
* Merge branch 'master' into eth1-majority-voting
* Merge branch 'master' into eth1-majority-voting
* split mainnet/onyx/altona/e2e configs into different files
* set onyx as the default network
* lint and fix comment
* more commentary
* gofmt
* Merge branch 'master' of github.com:prysmaticlabs/prysm into onyx-config
* gofmt