[18.0-fr1] [OSPRH-11692] node_exporter scrapeconfig must include full fqdn instead

[openshift-cherrypick-robot]

This is an automated cherry-pick of #535

/assign jlarriba

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[softwarefactory-project-zuul]

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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/3b07562ffbc4498489fe4ed057edec70

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 57m 25s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 19m 13s
✔️ telemetry-operator-multinode-autoscaling-tempest SUCCESS in 1h 12m 16s
❌ telemetry-operator-multinode-default-telemetry FAILURE in 1h 07m 09s
✔️ telemetry-operator-multinode-logging SUCCESS in 1h 24m 19s
✔️ functional-tests-on-osp18 SUCCESS in 1h 40m 27s (non-voting)

[jlarriba]

recheck