Rework the root device detection / creation stage

- Set rootdelay to 10 by default
- Skip the whole detection stage if we use root on nfs
- Use the new poll_device function to wait for at most $rootdelay seconds
- Always pass rootdelay=0 to kinit, as we ensure the existence of the root device
- Don't reboot after the fallback. This allows a user to fix a problem and continue booting
- Rely on kinit to detect the root filesystem type. The rootfstype= option can still be used to override
  Our old method would have failed as well, as the code for filesystem detection is the same

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