Update getResourceAllocation() of LinkResourceAllocations to return set of resource allocations

@@ -3,7 +3,8 @@ package org.onlab.onos.net.resource;
 /**
  * Representation of allocated bandwidth resource.
  */
-public class BandwidthResourceAllocation extends BandwidthResourceRequest {
+public class BandwidthResourceAllocation extends BandwidthResourceRequest
+        implements ResourceAllocation {
     /**
      * Creates a new {@link BandwidthResourceAllocation} with {@link Bandwidth}
      * object.

@@ -3,7 +3,8 @@ package org.onlab.onos.net.resource;
 /**
  * Representation of allocated lambda resource.
  */
-public class LambdaResourceAllocation extends LambdaResourceRequest {
+public class LambdaResourceAllocation extends LambdaResourceRequest
+        implements ResourceAllocation {
     private final Lambda lambda;
 
     /**

 package org.onlab.onos.net.resource;
 
+import java.util.Set;
+
 import org.onlab.onos.net.Link;
 
 /**
@@ -12,5 +14,5 @@ public interface LinkResourceAllocations extends LinkResourceRequest {
      * @param link the target link
      * @return allocated resource for the link
      */
-    ResourceAllocation getResourceAllocation(Link link);
+    Set<ResourceAllocation> getResourceAllocation(Link link);
 }