fix(offer): Fix a bad comment
refactor(config): Drop config opt boot_id
refactor(machine): Rename BootID to MachineID
refactor(job): centralize machine-req check into Job.RequiredTarget
refactor(job): Drop Boot from X-ConditionMachineBootID
doc(scheduling): Add note about machine-id location
refactor(offer): Rename MachineBootIds to MachineIDs
refactor(bid): Rename MachineBootId to MachineID
refactor(machine): Rename BootId to ID
Merge pull request #381 from bcwaldon/machine-id

Switch to Machine IDs