R1:78d2f08fcd80

Add an Aphlict CLI client

Summary: Depends on D2926. Adds a simple CLI client for Aphlict to make it easier to debug stuff.

Test Plan: Ran client, saw debug messages.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D2927