Enable checkstyle rule for JLS modifier order

JLS specifies a preferred order for modifiers in
declarations.  Enabled this rule and fixed the
problems that it encountered.

Change-Id: I5e8fa3d29f785ced4c61fbb8c7c8b168289f06e2
diff --git a/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java b/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java
index 8e4e12e..ae16c8f 100644
--- a/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java
+++ b/src/main/java/net/onrc/onos/apps/bgproute/RibEntry.java
@@ -22,7 +22,7 @@
      * The user of this class should make sure they don't check this data
      * if they don't provide it.
      */
-    private final static long NULL_TIME = -1;
+    private static final long NULL_TIME = -1;
 
     public RibEntry(InetAddress routerId, InetAddress nextHop) {
         this.routerId = routerId;