Expose default column value and attributes?
Should we offer an async version of this as well?
Probably should have a configurable timeout in KuduClientBuilder?
KUDU-809: make this hard-to-use constructor private. Clients should use the Builder API. Currently only the Python API uses this old API.
KUDU-1107: move above info to docs
Make this constructor private.
Remove KuduSchema::Reset().