R1:d13d6963dde0

phd - make stop / restart savvy to daemons without pid files

Summary: Ref T2374. This currently doesn't work in that while the daemons are stopped, they are restarted. How do I stop them for good? (If it worked I'd also give it a little pass for variable names, etc quality stuff)

Test Plan:
```
14:09:20 ~/Dropbox/code/phalanx (T2374)
~> sudo ./bin/phd restart
There are no running Phabricator daemons.
Freeing active task leases...
Freed 0 task lease(s).
Preparing to launch daemons.
NOTE: Logs will appear…