When allocating memory for the TDS packet, increase the request by 8 bytes
to handle the TDS packet header which is 8 bytes.
Provide a callback for when the DONE token is processed. Currently only
invoked after a query is completed.
For now, exit when an error of severity > 0 is returned.
Lower the verbosity when processing the ENVCHANGE token. At this point it, we
only need a verbose message when an ENVCHANGE change type is unknown.
Rename fire_query to tds_query.