remove duplicated/replaced tests

I believe there is no loss in test coverage through this action.

I manually compared the old tests and new tests to see that they covered the
same concepts. Most of them were duplicates to begin with. The one that wasn't
duplicated already, was moved to authenticated_test.go in a previous commit.

Since the deprecated service is no more, these tests are no longer
necessary. They had already be retro-fitted to test the replacement
service.Service anyway, where they all passed.

Author: ewollesen