Fix ansible 2.19 jinja incompatibilities

[rabi]

{{ mtu_list.append(lookup('vars', networks_lower[network] ~ '_mtu')) }} will print return value None and it will break the nic config.

jira: OSPRH-18609

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/15d1c0265c2c472a98ebc3c39c91e12a

✔️ noop SUCCESS in 0s
❌ adoption-standalone-to-crc-ceph FAILURE in 2h 19m 21s
❌ adoption-standalone-to-crc-no-ceph FAILURE in 2h 22m 22s
✔️ adoption-docs-preview SUCCESS in 1m 20s

[rabi]

@jistr Hey! can you help merge this one to avoid broken adoption jobs as the ansible pin has been removed with openstack-k8s-operators/edpm-ansible#993?

[jistr]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jistr

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [jistr]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[tosky]

/cherry-pick 18.0-fr3

[openshift-cherrypick-robot]

@tosky: new pull request created: #1035

Details

In response to this:

/cherry-pick 18.0-fr3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.