when a status.conditions has unknown it should be explicit

[bergerx]

Currently, we only color-code it based on the status field value. But the status field conventionally has one of these 3 values: "True", "False", "Unknown".

The current behavior is to accept Unknown as an explicit faulty status rather than missing information. We should be explicit about the "Unknown" value in such cases.

See https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#typical-status-properties for more details.