* Enable systemd-time-wait-sync.service by default
Enable the systemd-time-wait-sync.service by default. This allows to use
the time-sync.target which allows to make sure services only get started
once the time is synchronized.
* Make sure time is synchronized when starting hassos-supervisor.service
Use the time-sync.target to make sure that the Supervisor gets stsarted
after the time has been synchronized.
* Set timeout for systemd-time-wait-sync.service
Don't delay startup forever in case time synchronization doesn't work.
This allows to boot the system even without Internet connection.
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