Store daemon arguments in reference file.

Summary: Ref T4735. Store the arguments that were used to launch a daemon in the reference file. This will allow the daemon arguments to be echoed to the console for ./bin/phd status.

Test Plan: See D9208.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4735

Differential Revision: https://secure.phabricator.com/D9207