Do not use Unix-domain socket unless it is explicitly specified as a command line parameter.
Added -N parameter to skip start/stop of database engine.
Added -N option to skip database install. Also, pass --socket parameter to mysql client
only if it was explicitly provided.
Drop schema, if it is already exist. Get rid of DB_SCHEMA parameter, it isn't used by
dbt2_client anyway. From now on schema name will be the same as database name.
Remove temporary file.