[Bug 1849303] [NEW] printing adresses on server as structured data has the wrong structre

[Roald Strangstadstuen]

Public bug reported:

Running: 
```
openstack server show <server_id> -c addresses -f json
```

returns:
```json
{
  "addresses": "net1=192.168.111.203, 10.212.137.62"
}
```

expected:

```json
{
  "addresses": "net1": {"192.168.111.203", "10.212.137.62"}
}
```
tested with
openstack 3.14.2
openstack 4.0.0

** Affects: python-openstackclient (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1849303

Title:
  printing adresses on server as structured data has the wrong structre

Status in python-openstackclient package in Ubuntu:
  New

Bug description:
  Running: 
  ```
  openstack server show <server_id> -c addresses -f json
  ```

  returns:
  ```json
  {
    "addresses": "net1=192.168.111.203, 10.212.137.62"
  }
  ```

  expected:

  ```json
  {
    "addresses": "net1": {"192.168.111.203", "10.212.137.62"}
  }
  ```
  tested with
  openstack 3.14.2
  openstack 4.0.0

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