Cleanup configuration of Maven JUnit runner

Set the plugin version in the top-level pom, not the unit test pom.
This ensures the same plugin is used for all JUnit tests within the
overall project.

Drop the include **/*Test.java definition, as its no longer necessary
with the JUnit 4 based test suite.  All of the test classes now end
with "Test" and include @Test annotations on the test methods.

Change-Id: Ib2c180bf531e1a97e31979fcc281fa0fc5a1abb3
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit.test/pom.xml

@@ -124,12 +124,8 @@
     <plugins>
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
-        <version>2.4.2</version>
         <configuration>
           <argLine>-Xmx256m -Dfile.encoding=UTF-8</argLine>
-          <includes>
-            <include>**/*Test.java</include>
-          </includes>
         </configuration>
       </plugin>
     </plugins>

pom.xml

@@ -207,6 +207,12 @@
           <version>2.7</version>
         </plugin>
 
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.4.2</version>
+        </plugin>
+
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>build-helper-maven-plugin</artifactId>