Daemons - handle daemons that can't be killed a bit better

Summary:
Ref T2374. Fixes T5988.

Keep track of what's been killed and not been killed, and surface that maybe you need sudo if things don't get killed with --force

...also basically make this force thing work. I managed to convinced myself stuff was getting killed with --force when it mostly wasn't. Make sure the --force parameter gets pushed as low as it needs to go to have things get killed.

Test Plan:
 - `sudo ./bin/phd restart`
 - `rm -rf /var/tmp/phd/pid/*`
 - `./bin/phd stop` --> get warning about rogue daemons
 - `./bin/phd stop X` --> get warning about no running daemons
 - `./bin/phd stop --force` --> get warning about not being able to kill daemons
 - `sudo ./bin/phd stop --force` --> kill daemons successfully

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T2374, T5988

Differential Revision: https://secure.phabricator.com/D10386