DRILL-4925: Add tableType filter to GetTables metadata query
- Adding tableType filter to GetTablesReq query (needed for JDBC and ODBC
drivers).
- Fix table type returned by sys and INFORMATION_SCHEMA tables
- Also fixes some protobuf typos to related classes.
this closes #612
Change-Id: If95246a312f6c6d64a88872936f516308874c2d2
