AddFQDNOnChangeCallback takes a callback function that will be called with the new and old values of `flags.fqdnEnabled` whenever it changes.

Apply receives a config and applies it.

FQDN reports if FQDN should be used instead of hostname for host.name.

Parse receives a policy, parses and returns it.

RemoveFQDNOnChangeCallback removes the callback function associated with the given ID (originally returned by `AddFQDNOnChangeCallback` so that function will be no longer be called when `flags.fqdnEnabled` changes.

TamperProtection reports if tamper protection feature is enabled.