TestUser creates the user and therefore needs the database. Avoid using
it in non-database tests.
Add ApiQueryBlockInfoTraitTest to the Database group because it needs
the database.
Add DeleteUserEmailTest to the Database group because since 3bedffa8
the default user is not created any more in non-database tests
Change-Id: Iff438964dde47a47a2fa4a314d55010bd8c7fee5