refactor(job): Move machine metadata parsing to job pkg
refactor(job): Move unit file option constants to job pkg
refactor(job): Move Requirements from Unit to Job
Merge pull request #401 from bcwaldon/refactor-job-reqs

Relocate some Job requirements code
refactor(unit): Drop old socket-publishing code
Merge pull request #404 from bcwaldon/drop-socket-state

Drop old socket-publishing code
refactor(systemd): Drop dead code
doc(config): Remove old docs regarding boot_id
doc(example): Update example-deployment.md examples
refactor(job): marshal only Name and UnitHash for jobs