openSUSE / agama / 10700403650

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feat(storage): config support to delete partitions (#1572)

Allow using *delete* and *deleteIfNeeded* for a partition section in the
storage JSON config, according to the
[auto_storage](https://github.com/openSUSE/agama/blob/master/doc/auto_storage.md)
document.

Notes about the schema:

* *delete* and *deleteIfNeeded* cannot be set at the same time.
* If *delete* is set, then *search* is mandatory and no other property
is accepted.
* If *deleteIfNeeded* is set, then *search* is mandatory and *size* is
optional. No other property is accepted.

Examples:

* Delete a partition:

~~~json
{
  "search": "/dev/vda",
  "delete": true
}
~~~

* Delete a partition on demand:

~~~json
{
  "search": "/dev/vda",
  "deleteIfNeeded": true
}
~~~

* Resize or delete a partition on demand (resize is not implemenetd
yet):

~~~json
{
  "search": "/dev/vda",
  "size": { "min": 0 },
  "deleteIfNeeded": true
}
~~~

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