Fix ansible 2.19 jinja incompatibility

[rabi]

With ansible 2.19 it prints the return value of the mtu_list.append() as None and the network config is not parseable with os-net-config and it fails with,

os_net_config.main No interfaces defined in config: /etc/os-net-config/config.yaml"]}

jira: OSPRH-18609

[rabi]

We need to merge this, as openstack-k8s-operators/edpm-ansible#993 has already merged.

[danpawlik]

I don't like the commit message, but I can live with that.

[rabi]

I don't like the commit message, but I can live with that.

Linked jira has the details. Anyway, I've updated it now.

[jokke-ilujo]

/approve

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[danpawlik]

Probably it would fix error:

fatal: [compute-0]: FAILED! => {"ansible_job_id": "j925253240665.63263", "changed": false, "finished": true, "msg": "Running os-net-config --config-file /etc/os-net-config
/config.yaml --cleanup --debug --detailed-exit-codes --provider nmstate failed with return code 1.", "rc": 1, "results_file": "/root/.ansible_async/j925253240665.63263", "
started": true, "stderr": "", "stderr_lines": [], "stdout": "2025-08-12 07:01:40.883 INFO os_net_config.main Using config file at: /etc/os-net-config/config.yaml\n2025-08-
12 07:01:40.883 INFO os_net_config.main Not using any mapping file.\n2025-08-12 07:01:40.883 INFO os_net_config.get_iface_config Reading /etc/os-net-config/config.yaml for
 network_config section\n2025-08-12 07:01:40.889 INFO os_net_config.common.print_config \nnetwork_config:\nnull\n...\n\n2025-08-12 07:01:40.889 ERROR os_net_config.get_ifa
ce_config No interfaces defined in config: /etc/os-net-config/config.yaml\n", "stdout_lines": ["2025-08-12 07:01:40.883 INFO os_net_config.main Using config file at: /etc/
os-net-config/config.yaml", "2025-08-12 07:01:40.883 INFO os_net_config.main Not using any mapping file.", "2025-08-12 07:01:40.883 INFO os_net_config.get_iface_config Rea
ding /etc/os-net-config/config.yaml for network_config section", "2025-08-12 07:01:40.889 INFO os_net_config.common.print_config ", "network_config:", "null", "...", "", "
2025-08-12 07:01:40.889 ERROR os_net_config.get_iface_config No interfaces defined in config: /etc/os-net-config/config.yaml"]}

[tosky]

/cherry-pick 18.0-fr3

[openshift-cherrypick-robot]

@tosky: cannot checkout 18.0-fr3: error checking out "18.0-fr3": exit status 1 error: pathspec '18.0-fr3' did not match any file(s) known to git

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In response to this:

/cherry-pick 18.0-fr3

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[tosky]

/cherry-pick 18.0-fr3

Ups, please ignore this, I just wanted to backport a similar change in another repository and used the wrong browser window.