Fix bug where the values of keys could change

Change-Id: I34993c413c3f928690701a055ec38c1e7029b473

@@ -17,7 +17,6 @@ package org.onosproject.sdnip;
 
 import com.google.common.collect.Sets;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.onlab.junit.TestUtils;
 import org.onlab.junit.TestUtils.TestUtilsException;

@@ -90,7 +90,7 @@ public class Key {
     private static final class LongKey extends Key {
 
         private final ApplicationId appId;
-        private static long key;
+        private final long key;
 
         private LongKey(long key, ApplicationId appId) {
             super(HASH_FN.newHasher()