remove search domain from response

[Luap99]

Podman will use this as main search domain and ignore everything else then. We don't need to set the search domain at all, aardvark-dns resolves names without it fine.

Fixes: #1133 Fixes: https://issues.redhat.com/browse/RHEL-83787

[openshift-ci[bot]]

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[mheon]

LGTM

[baude]

/lgtm