clog: default -v to 3, set info logging to 3

[iameli-streams]

What does this pull request do? Explain your changes. (required)
Running a Catalyst node with a broadcaster and orchestrator is absurdly verbose right now. It's like dozens of log lines a second. While we want some of this stuff in production, in many cases I want to disable it; this PR lets me do that with -v=2.

Specific updates (required)

• Sets the default -v level to "3"
• Adjusts clog so that the default "INFO" level logs at -v level 3, WARNING logs at 2, and ERROR logs at 1.

How did you test each of these updates (required)
Ran on my local Catalyst node that I'm developing for Livepeer in a Box v3.

Checklist:

• [x Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated