godbc finishing touches

[Habbie]

• [x] add charset to docs (see test-auth)
• [x] add godbc_sqlite3 to start-test-stop help
• [ ] hide passwords during test run
• [ ] use pdnssec load-zone (but deal with nztest.com somehow) (this would probably also hide the passwords) (#2968)
• [ ] make it possible to log SUCCESS_WITH_INFO instead of erroring on it?
• [x] via @cmouse: Perhaps not cast everything to long, but handle binds of various integer types correctly?
• [ ] fix set-tsig-key-query default for mssql
• [ ] don't silently truncate SELECT results over 128kbyte per cell
• [ ] make SELECT results null-safe
• [ ] have one final look at the SQL_NO_DATA/NOCOUNT/multiple result set stuff
• [x] query logging

[Habbie]

The few odbc users we have seem happy, so I'm bumping these touches to a later version.