Move Aphlict logging and PID configuration options to config file

Summary: Ref T10697. Mostly straightforward. Also allow the server to have multiple logs and log options in the future (e.g., different verbosities or separate admin/client logs or whatever). No specific plans for this, but the default log is pretty noisy today.

Test Plan: Set up a couple of logs, started server, saw it log to them.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10697

Differential Revision: https://secure.phabricator.com/D15702