[ONOS-3480] Implement MPLS TC Criterion to Southbound

Change-Id: I6fab221785b07f1962d43a86dd0af664be40a537
diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/Criteria.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/Criteria.java
index f13026c..a28a4ab 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/Criteria.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/Criteria.java
@@ -453,6 +453,16 @@
     }
 
     /**
+     * Creates a match on MPLS TC.
+     *
+     * @param mplsTc MPLS TC (3 bits)
+     * @return match criterion
+     */
+    public static Criterion matchMplsTc(byte mplsTc) {
+        return new MplsTcCriterion(mplsTc);
+    }
+
+    /**
      * Creates a match on Tunnel ID.
      *
      * @param tunnelId Tunnel ID (64 bits)