minor refactor of LogManagerTest

git-svn-id: https://svn.apache.org/repos/asf/harmony/enhanced/classlib/trunk@906429 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/modules/logging/src/test/java/org/apache/harmony/logging/tests/java/util/logging/LogManagerTest.java b/modules/logging/src/test/java/org/apache/harmony/logging/tests/java/util/logging/LogManagerTest.java
index 28bf612..cf350fd 100644
--- a/modules/logging/src/test/java/org/apache/harmony/logging/tests/java/util/logging/LogManagerTest.java
+++ b/modules/logging/src/test/java/org/apache/harmony/logging/tests/java/util/logging/LogManagerTest.java
@@ -814,11 +814,9 @@
     }
 
     public void testValidConfigClass() throws Exception {
-        String oldPropertyValue = System
-                .getProperty("java.util.logging.config.class");
+        String oldPropertyValue = System.getProperty(CONFIG_CLASS);
         try {
-            System.setProperty("java.util.logging.config.class", this
-                    .getClass().getName()
+            System.setProperty(CONFIG_CLASS, this.getClass().getName()
                     + "$ConfigClass");
             assertNull(manager.getLogger("testConfigClass.foo"));