Ensure all tests are written junit4 way

Currently most of the tests in JBWS project are written using @RunWith(Arquillian.class) whereas there are others extending TestCase class from junit framework. The latter is the junit3 way of writing tests which relies on test method name convention.

Furthermore, almost all tests transitively extends TestCase via JBossWSTest despite of using @RunWith. In some cases that leads to situations where some test methods are actually skipped because they miss @Test annotation, which were probably missed within migration to Arquillian.

We should ensure all tests are annotated with @Test. We also should remove inheritance from TestCase class and instead use Assert.* methods directly.