uni04delta: set IronicDefaultNetworkInterface

[hjensas]

For IPv6 we should use the "neutron" interface as the default network interface in ironic conductor config.

This change ensures this is set for the uni04delta-ipv6 OSP17 cloud as well as in the RHOSO cloud.

Jira: OSPRH-20021

[openshift-ci]

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/aa13fef3f51f4724976d1c31fe1410ab

✔️ noop SUCCESS in 0s
❌ adoption-standalone-to-crc-ceph FAILURE in 1h 29m 17s
✔️ adoption-standalone-to-crc-no-ceph SUCCESS in 2h 55m 51s

[hjensas]

recheck

[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/78430d65935f4aa5bc5bc2fb645a9524

✔️ noop SUCCESS in 0s
❌ adoption-standalone-to-crc-ceph RETRY_LIMIT in 21m 18s
✔️ adoption-standalone-to-crc-no-ceph SUCCESS in 2h 42m 17s