Remove JourndalDAO tests and fix NullDAO tests.
Remove JourndalDAO tests and fix NullDAO tests.

JournalDAO was re-written, the test were testing the old interface and
as such do not provide any value.

TanayParikh/foam2,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,TanayParikh/foam2,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm,TanayParikh/foam2,foam-framework/foam2,foam-framework/foam2,TanayParikh/foam2,jacksonic/vjlofvhjfgm