R1:d89b8ce2b2c8

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…