jcronenberg / agama / 15134168953

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Add bridge support for the HTTP API and CLI (#2258)

## Problem

Although there is a bridge model in the backend, there is no way to
configure it through the CLI or through the HTTP api.

-
https://trello.com/c/LoDehu4m/4559-1-agama-add-support-for-configuring-a-bridge


## Solution

Added bridge support similar to what was added for bonding in
(https://github.com/agama-project/agama/pull/885) and also fix it
because looks like we broke the bonding handling when moved to the HTTP
Api (https://github.com/agama-project/agama/pull/1064).

An example of the json bridge configuration looks like:

```json
{
  "network": {
    "connections": [
      {
        "id": "Bridge0",
        "method4": "manual",
        "interface": "br0",
        "addresses": ["192.168.1.100/24"],
        "gateway4": "192.168.1.1",
        "nameservers": ["192.168.1.1"],
        "bridge": {
          "ports": ["eth0", "eth1"],
          "stp": false
        }
      }
    ]
  }
}
```

## Testing

- *Added a new unit test*
- *Tested manually*

92 of 132 branches covered (69.7%)

Branch coverage included in aggregate %.

91 of 119 new or added lines in 7 files covered. (76.47%)

12909 of 20502 relevant lines covered (62.96%)

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