As I discovered the hard way, these tests fail on the FTS because of
differences with psycopg2

Update the tests, and verify their passing, on the FTS
merge tjoneslo: As I discovered the hard way, these tests fail on the FTS because of

Merge pull request #1322 from tjoneslo/sql-layer/fix-varchar-previous-fixes
https://github.com/FoundationDB/sql-layer/pull/1322