agama-project / agama / 11514248191

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Resolve search sections that match several devices (#1691)

## Problem

The search functionality described at `auto_storage.md` is pretty
powerful. But the current implementation only allows to:

- search by name
- return 0 or 1 devices per search

## Solution

This implements several parts of the missing functionality, like:

- Ability to match more than one device per `search` section
- Limit the number of matches by using `max`.

This pull request does not add the ability to use other conditions or
matching order beyond `name`. So it's only possible to search either for
a device with a given name, either for all the devices sorted by name.
The syntax for the latter would be this (a search with no conditions):

```
{ "search": {} }
```

For readability, the following alternative syntax is also introduced at
this pull request:

```
{ "search": "*" }
```

The new default for drive entries (if omitted) becomes:

```
{ "search": { "max": 1 } }
```

If several devices match with a given `search` section, the
corresponding configuration containing the `search` is replicated as
many times as needed. Eg. in a system with two disks, the following
config...

```
{
  "storage": {
    "drives": [
      { "search": "*" }
    ]
  }
}
```

...is expanded into:

```
{
  "storage": {
    "drives": [
      { "search": "*" },
      { "search": "*" }
    ]
  }
}
```

This also makes sure everything keeps working when an `alias` is used
together with a `search` that matches several devices (so all the
resulting config objects share the same alias).

## Testing

- Adapted existing unit tests and added a new ones regarding the
`search` functionality
- Added a new unit test to check that resolving a config into several
ones (potentially with a shared alias) works as expected.

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