R1:e32ce529d73f

Begin generalizing Aphlict server to prepare for clustering/sensible config file

Summary:
Ref T10697. Currently, `aphlict` takes a ton of command line flags to configure exactly one admin server and exactly one client server.

I want to replace this with a config file. Additionally, I plan to support:

- arbitrary numbers of listening client ports;
- arbitrary numbers of listening admin ports;
- SSL on any port.

For now, just transform the arguments to look like they're a config file. In the future…