rethink unit test style to remove duplication

[teleivo (Ivo Ulrich)]

@teleivo

• should I add a checkstyle rule that flags the use of org.openmrs.test.Verifies ?(this can help reviewers as codacy will show it on PRs, guess its easy to overlook)
• should org.openmrs.test.Verifies be deprecated?

so we get people away from it. I mean the annotation can be removed at a time far in the future but its important we advocate against it from now on.

@darius and @wyclif your votes on this?