Initialize round by any B/O who has the initializeRound flag set to true

[leszko]

AFAIU the current logic for the -initializeRound flag has the assumption that every O has this flag set to true. Then, it uses some calculation to decide which O sends the tx to initialize the round.

The assumption is not true and with most O having -initializeRound false we end up with the round not being initialized. This PR removes all this logic for checking who should intialize the round and just any B/O that has this flag enabled will try to initialize the round. The worst that can happen is that a lot of B/Os will try to initialize the round, but the gas price is low, so that's not too bad.

After this PR gets merged I'll set it to true in all Bs in staging for Livepeer Inc.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 42 lines in your changes are missing coverage. Please review.

Project coverage is 57.32866%. Comparing base (9305333) to head (5ae9efe).

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3029         +/-   ##
===================================================
- Coverage   57.48217%   57.32866%   -0.15351%     
===================================================
  Files             92          92                 
  Lines          15704       15685         -19     
===================================================
- Hits            9027        8992         -35     
- Misses          6077        6091         +14     
- Partials         600         602          +2     

Files	Coverage Δ
cmd/livepeer/livepeer.go	50.00000% <100.00000%> (+0.33557%)	⬆️
eth/roundinitializer.go	75.40984% <35.71429%> (-17.36124%)	⬇️
cmd/livepeer/starter/starter.go	7.17897% <0.00000%> (-0.01455%)	⬇️

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9305333...5ae9efe. Read the comment docs.

Files	Coverage Δ
cmd/livepeer/livepeer.go	50.00000% <100.00000%> (+0.33557%)	⬆️
eth/roundinitializer.go	75.40984% <35.71429%> (-17.36124%)	⬇️
cmd/livepeer/starter/starter.go	7.17897% <0.00000%> (-0.01455%)	⬇️

... and 1 file with indirect coverage changes

[victorges]

LGTM

I have a suggestion for a logic to avoid so many failed transactions onchain every day, but if you prefer to continue with the current version it's fine with me. I'd just request for us not to enable the -initializeRound flag on all of our Bs, otherwise it's gonna be a lot of pollution onchain.

[victorges]

LGTM!

If you're merging this without squash keep in mind that there's a duplicate commit (msg) in the history (I just prefer squash myself)