R1:0ccebbe4b1dd

Query daemons across all hosts with `./bin/phd status --all`.

Summary: Ref T4209. Currently, `./bin/phd status` prints a table showing the daemons that are executing on the current host. It would be useful to be able to conventiently query the daemons running across all hosts. This would also (theoretically) make it possible to conditionally start daemons on a host depending upon the current state and on the daemons running on other hosts.

Test Plan:
```
> ./bin/phd status --all
ID Host…