Move LRUHashMap from RoutingImpl to util.

src/main/java/net/floodlightcontroller/routing/dijkstra/RoutingImpl.java

@@ -46,6 +46,7 @@ import net.floodlightcontroller.topology.ILinkDiscovery;
 import net.floodlightcontroller.topology.ILinkDiscoveryListener;
 import net.floodlightcontroller.topology.ILinkDiscoveryService;
 import net.floodlightcontroller.topology.ITopologyListener;
+import net.floodlightcontroller.util.LRUHashMap;
 
 /**
  * Floodlight component to find shortest paths based on dijkstra's algorithm

src/main/java/net/floodlightcontroller/routing/dijkstra/LRUHashMap.java → src/main/java/net/floodlightcontroller/util/LRUHashMap.java

@@ -15,7 +15,7 @@
 *    under the License.
 **/
 
-package net.floodlightcontroller.routing.dijkstra;
+package net.floodlightcontroller.util;
 
 import java.util.LinkedHashMap;
 import java.util.Map;