Looks like the get-master-root-disk-size() and get-master-disk-size() functions didn't anticipate clusters bigger than 2K nodes. In https://github.com/kubernetes/kubernetes/issues/72976 we found out that 100GB may be not enough for large clusters (5K nodes) when it comes to master root disk size. Updating both get-master-root-disk-size() and get-master-disk-size() to make them consistent and match cluster sizes with get-master-size() function.