Add test project for java plugin.

Only tests java:compile at the moment.

Change test project goal to "testPlugin" as it was conflicting with the test plugin
causing reactor issues


git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@114027 13f79535-47bb-0310-9956-ffa450edef68

changes/src/test/plugin-test/maven.xml

@@ -1,7 +1,7 @@
 <project xmlns:util="jelly:util"
          xmlns:j="jelly:core">
          
-  <goal name="test" prereqs="test-changes-report">
+  <goal name="testPlugin" prereqs="test-changes-report">
     <attainGoal name="clean"/>
   </goal>