Cherry pick commits from branch targeting streamflow

[yondonfu]

What does this pull request do? Explain your changes. (required)

This PR cherry picks a few commits that are relevant for the confluence branch as well from https://github.com/livepeer/protocol/pull/515.

The cherry picked commits are:

https://github.com/livepeer/protocol/pull/515/commits/153d2e61a7eb5eabed52149834d3394440f432c9 https://github.com/livepeer/protocol/pull/515/commits/bf30a03d0a277bac752bb5eb2a038ff926342ed2 https://github.com/livepeer/protocol/pull/515/commits/0c121904ed4dadcd15b1aa5c36dbe0f700ac52c0

Specific updates (required)

Just contains cherry picked commits from another PR.

How did you test each of these updates (required)

Ran test suite.

Does this pull request close any open issues?

N/A

Checklist:

• [x] README and other documentation updated
• [x] All tests using yarn test pass