BugFix: Comparing MplsLabel against int

- MplsCriterion#label() returns MplsLabel, while
  ModMplsLabelInstruction#label() returns int

Change-Id: Ia0d57651fd3553ffb4e4f07dc51c420a09028f6e

@@ -342,10 +342,15 @@ public abstract class L2ModificationInstruction implements Instruction {
             this.mplsLabel = mplsLabel;
         }
 
+        // might want to deprecate this in the long run
         public Integer label() {
             return mplsLabel.toInt();
         }
 
+        public MplsLabel mplsLabel() {
+            return mplsLabel;
+        }
+
         @Override
         public L2SubType subtype() {
             return L2SubType.MPLS_LABEL;

@@ -252,7 +252,7 @@ public final class FlowObjectiveCompositionUtil {
                         case MPLS_LABEL:
                             if (criterionMap.containsKey(Criterion.Type.MPLS_LABEL)) {
                                 if (((MplsCriterion) criterionMap.get((Criterion.Type.MPLS_LABEL))).label()
-                                        .equals(((L2ModificationInstruction.ModMplsLabelInstruction) l2).label())) {
+                                        .equals(((L2ModificationInstruction.ModMplsLabelInstruction) l2).mplsLabel())) {
                                     criterionMap.remove(Criterion.Type.ETH_DST);
                                 } else {
                                     return null;