MAAS generates netplan with illegal autoconf and accept_ra flags for 22.04

[Boris Lukashev]

When configuring bonds through the CLI (API), we normally add accept_ra=false autoconf=false parameters - produces:
```
    version: 2
    vlans:
        bond0.223:
            accept_ra: 0
            addresses:
```
Turns out, this is illegal on 22.04:
```
/var/log/cloud-init.log: /etc/netplan/50-cloud-init.yaml:70:13: Error in network definition: unknown key 'accept_ra'
```
which prevents nodes from completing provisioning.
Might be worth implementing a filter for the parameter to exclude it from OS' which don't support it as it completely cuts the node off from comms until placed into rescue mode by maas.

[Lukas Märdian (slyon)]

I guess this should be called "accept-ra: false" instead?
https://netplan.readthedocs.io/en/stable/netplan-yaml/#properties-for-all-device-types

[Boris Lukashev (rageltman)]

Given that both the generator and consumer of the plan (not to mention the netplan abomination itself) are canonical products, I defer to the Ubuntu experts on how this should be constructed :).

I'm now debugging (trying to rescue-mode) the `autoconf=false` option, having removed accept_ra from my CLI config and rebuilt all VLANs on the bonds, because the nodes are still not coming up with network access in the subnets on VLANs of their bonds...

Is there any CI/CD pipe out there testing outcomes of configuration in terms of applying all combinations of config parameters permissible through the API/CLI to all supported (or at least Canonical) targets? We're at 22.04.2 - was a full complement of tests performed on .0, .1, and .2 of the long-term supported release?

[Boris Lukashev (rageltman)]

Awesome, so _neither_ of the optional parameters are valid under 22.04...
Autoconf gets written into netplan as:
```
    vlans:
        bond0.222:
            addresses:
            - 10.2.1.22/24
            autoconf: 0
```
which causes
```
/mnt/zfs/var/log/cloud-init-output.log: /etc/netplan/50-cloud-init.yaml:72:13: Error in network definition: unknown key 'autoconf'

```

[Alberto Donato (ack)]

What version of MAAS are you using? The accept_ra issue (see LP:1927036) should befixed in 3.0.0.

[Boris Lukashev (rageltman)]

@alberto donato: 3.3/stable snap channel.

[Alberto Donato (ack)]

Could you please paste the output of

maas $profile machine read $system_id

and

maas $profile machine get-curtin-config $system_id

for the machine configured with the bond?