Improving function get_failure_domain()

[AviadP]

• Deleted global variable _FAILURE_DOMAINS
• Added new method: _get_failure_domains_from_storagecluster()
• Modified get_failure_domains() with priority fallback

Sometimes failure domains queried before blockpools are ready, which cause

        # Call setup function directly
        storage_cluster = self.replica1_setup()
        failure_domains = get_failure_domains()
        testing_pod = create_pod_on_failure_domain(
            project_factory,
>           failure_domain=failure_domains[0],
        )
E       IndexError: list index out of range

tests/functional/storageclass/test_replica1.py:328: IndexError

[openshift-ci]

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