Fix Compiler warnings

src/main/java/net/floodlightcontroller/util/TimedCache.java

@@ -30,8 +30,6 @@ import java.util.concurrent.ConcurrentMap;
  * @param <K> Type of the values in this cache
  */
 public class TimedCache<K> {
-    private static final long serialVersionUID = 1L;
-    
     private final long timeoutInterval;    //specified in milliseconds.
 	private ConcurrentMap<K, Long> cache;
     private long cacheHits;

src/test/java/net/floodlightcontroller/core/internal/ControllerTest.java

@@ -27,7 +27,6 @@ import java.util.List;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 import net.floodlightcontroller.core.FloodlightContext;