Several unit tests fail when user is connected to Kubernetes cluster which is not accessible

[jiripetrlik]

Following unit tests fail when the user is connected to kubernetes cluster which is not accessible:

• tests/unit_test.py::test_ray_details
• tests/unit_test.py::test_cluster_status
• tests/unit_test.py::test_wait_ready

Unit tests pass successfully when user is not connected to kubernetes cluster (there is no "~/.kube/config") or if the user is connected to working Kubernetes cluster.

@Maxusmusti @MichaelClifford I'm not sure if this is expected behavior or not. Because if I'm connected to the cluster which works properly then tests pass. But if I understand correctly unit tests should never connect to existing cluster. What do you think?