Removed suggestion to use root dataset as bootfs

The dracut howto proposed to boot from the root dataset of a pool.
Apart from this giving problems when booting (as the code seems to
expect a child dataset and creates an illegal dataset name when using
the root dataset) the technical limitations of the root dataset
(among others the inability to rename or destroy through the `zfs`
command) resulted in the general consensus to only use it as a
container for the datasets in the pool - not as a filesystem itself.

Removed the idea to boot from the root dataset.

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: bunder2015 <[email protected]>
Signed-off-by: Gregor Kopka <[email protected]>
Closes #8247 

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