Replace the deprecated in the FourEyesTest

[OpenPj]

The sample unit test is using a deprecated class (SpringJUnit4ClassRunner):

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = ApplicationWhitelistingTestConfiguration.class)
public class FourEyesTest {

We can probably simplify and change it with the following:

@SpringJUnitConfig(classes = ApplicationWhitelistingTestConfiguration.class)
public class FourEyesTest {