Remove test prefix from test methods

We previously used 'test' to prefix tests but have decided to stop this.
This change removes the prefix from all test code.

Change-Id: I229a36751adc6a87fbae8d6f373671e141529496

gerrit-patch-jgit/src/test/java/org/eclipse/jgit/diff/EditDeserializerTest.java

@@ -20,7 +20,7 @@ import org.junit.Test;
 
 public class EditDeserializerTest {
   @Test
-  public void testDiffDeserializer() {
+  public void diffDeserializer() {
     assertNotNull("edit deserializer", new EditDeserializer());
   }
 }