Cleaned some imports

Whouldn't this be better?

This way there's a kind of cleaner way to have imports.

src/test/java/com/dmdirc/config/ConfigManagerTest.java

 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.mockito.Mockito.anyString;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.never;
-import static org.mockito.Mockito.verify;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
 
 @RunWith(MockitoJUnitRunner.class)
 public class ConfigManagerTest {