Upgrade to JUnit 4

Migrate existing tests to JUNit 4. Rename the model classes
TestAddress and TestPerson[2] so that they are not regarded
as test classes by the maven surefire plugin.

Change-Id: Id4dd2edaa507e89909dd97ee26628b6e8a1bdd04
Signed-off-by: Adrian Goerler <adrian.goerler@sap.com>
22 files changed