openSUSE / agama / 9679104435

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feat(storage): load storage config for guided proposal  (#1293)

Add CLI support for setting and getting the storage config.

### Load (set) storage settings from a config file:

~~~
$ agama config load < config.json
~~~

* The given settings must match the JSON schema defined by
https://github.com/openSUSE/agama/pull/1263 (not finished yet).
* The storage service calculates either a guided proposal or an AutoYaST
proposal, depending on the given config.

Config for a guided proposal:

~~~json
{
  "storage": {
    "guided": {
      "target": {
        "disk": "/dev/vdc"
      }
    }
  }
}
~~~

Config for an AutoYaST proposal:

~~~json
{
  "legacyAutoyastStorage": [
    {
      "device": "/dev/vdc",
      "use": "all"
    }
  ]
}
~~~

### Recover (get) the storage config:

~~~
$ agama config show > config.json
$ agama config edit
~~~

NOTES

* The storage service should check whether the given settings fulfill
the JSON schema.
* Checking the schema is not done yet because the schema definition is
not finished.

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