Checkstyle fixes for tests

- Fixed some checkstyle errors which seemed easier to fix.

Change-Id: I9dadd2e8f98b560fadcc2b704ac52ff8f8b93913
diff --git a/src/test/java/net/onrc/onos/core/intent/ConstrainedBFSTreeTest.java b/src/test/java/net/onrc/onos/core/intent/ConstrainedBFSTreeTest.java
index 8d5a6d6..0e4ce87 100644
--- a/src/test/java/net/onrc/onos/core/intent/ConstrainedBFSTreeTest.java
+++ b/src/test/java/net/onrc/onos/core/intent/ConstrainedBFSTreeTest.java
@@ -14,7 +14,7 @@
  * @author Toshio Koide (t-koide@onlab.us)
  */
 public class ConstrainedBFSTreeTest {
-    static long LOCAL_PORT = 0xFFFEL;
+    static final long LOCAL_PORT = 0xFFFEL;
 
     @Before
     public void setUp() throws Exception {
@@ -141,4 +141,4 @@
 
         assertNull(path3);
     }
-}
\ No newline at end of file
+}