contrived a build plan which would fail if resumed partway through:
- lease a working copy
- command `touch restart_{build.id}`
- command `test -e restart_{build.id} && rm restart_{build.id} && sleep 60`
followed old procedure:
- run a few of these builds manually
- `./bin/phd stop`
- `./bin/phd start`
- saw the builds fail
followed new procedure:
- run a few of these builds manually
- `./bin/phd stop`
- `./bin/harbormaster restart --active`
- `./bin/phd start`
- saw the builds pass