Remove squawker CLI and associated code?

[brianpeiris]

Automated squawker bots will be superseded by https://github.com/mozilla/hubs/pull/370, so we can probably remove the related code from this repo. Specifically:

• https://github.com/mozilla/janus-plugin-sfu/blob/master/client/squawkers-cli.js
• https://github.com/mozilla/janus-plugin-sfu/blob/master/client/squawkers.js#L148-L160
• and maybe all of https://github.com/mozilla/janus-plugin-sfu/blob/master/client/squawkers.js#L142-L195

[mqp]

Yeah, I agree. I will clean this stuff up.