Use dns cluster info from lib common get function

[averdagu]

Openshift coreDNS creates the domain name using an string located in dnses.operator.openshift.io. This string can change in the future, calling lib-common/GetDNSClusterDomain the responsability of gathering this information correctly only falls under lib-common intead of all operators.

Resolves: OSPRH-3627
Depends-on: openstack-k8s-operators/lib-common#580

[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

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[openshift-ci]

@averdagu: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/precommit-check	0f6c47d	link	unknown	/test precommit-check
ci/prow/telemetry-operator-build-deploy-kuttl	09a19a6	link	true	/test telemetry-operator-build-deploy-kuttl

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