Modernize architecture of phd

Summary:
Ref T1670. Mostly, use PhutilArgumentParser. This breaks up the mismash of functional stuff and PhabriatorDaemonControl into proper argumentparser Workflows.

There are no functional changes, except that I removed the "pingConduit()" call prior to starting daemons, because I intend to remove all Conduit integration.

Test Plan:

• Ran phd list.
• Ran phd status (running daemons).
• Ran phd status (no running daemons).
• Ran phd stop <pid> (dead task).
• Ran phd stop <pid> (live task).
• Ran phd stop zebra (invalid PID).
• Ran phd stop 1 (bad PID).
• Ran phd stop.
• Ran phd debug zebra (no match).
• Ran phd debug e (ambiguous).
• Ran phd debug task.
• Ran phd launch task.
• Ran phd launch 0 task (invalid arg).
• Ran phd launch 2 task.
• Ran phd help.
• Ran phd help list.
• Ran phd start.
• Ran phd restart.
• Looked at Repositories (daemon running).
• Looked at Repositories (daemon not running).

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1670

Differential Revision: https://secure.phabricator.com/D6490