Enable three of the four FK metadata tests. Uncover one problem with the
FK columns query, which is also fixed.

In addition this check some of the getColumns() problems.
merge tjoneslo: Enable three of the four FK metadata tests.

Merge pull request #23 from tjoneslo/pgjdbc/enable-fk-tests
https://github.com/FoundationDB/sql-layer-jdbc/pull/23