Major Description
Since the time source for the hybrid clock is now configurable (and even auto-configurable), it's important to ensure that the time source is configured consistently across the cluster. At least, there should be a way to spot discrepancies in the time source across all Kudu servers (masters/tservers).
Let's add extra functionality into the kudu cluster ksck logic to verify that the time source is configured uniformly across Kudu cluster.