MGMT-14094: Manage case when no resources are found in OCI

[adriengentil]

Check that a state file was generated by the import process. When no
state file is present, it means no resources were found in the
compartment.

Exclude network load blancer backend, backend_set and listener resources
from deletion as they will be deleted when the parent LB is deleted.

[openshift-ci-robot]

@adriengentil: This pull request references MGMT-14094 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.15.0" version, but no target version was set.

In response to this:

Check that a state file was generated by the import process. When no
state file is present, it means no resources were found in the
compartment.

Exclude network load blancer backend, backend_set and listener resources
from deletion as they will be deleted when the parent LB is deleted.

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/test-infra repository.

[adriengentil]

/cc @rccrdpccl @osherdp

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adriengentil

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[rccrdpccl]

/lgtm

[openshift-ci]

@adriengentil: The following test 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/e2e-metal-single-node-live-iso	6b79d3e	link	false	/test e2e-metal-single-node-live-iso

Full PR test history. Your PR dashboard.

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/test-infra repository. I understand the commands that are listed here.