Daemons - add phd-daemon support for findRunningDaemons

Summary: Ref T2374.

Test Plan: D10354 now works...!

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T2374

Differential Revision: https://secure.phabricator.com/D10357