Change MplsOudp destination port to IANA port

Right now the destination port that Vrouter uses in MplsOudp packet is
51234 which is not by IANA. But Vrouter is accepting the packets in the
reception path both old and new port numbers. With this change we will
be sening the destination port also to be IANA assigned port.

Change-Id: Ida38a910e9d26c2527bd9bb9cb19d462bdd10adc
closes-bug: #1420905

include/vr_mpls.h

@@ -15,7 +15,7 @@
 
 #define VR_MPLS_OVER_UDP_OLD_DST_PORT   51234
 #define VR_MPLS_OVER_UDP_NEW_DST_PORT   6635
-#define VR_MPLS_OVER_UDP_DST_PORT       VR_MPLS_OVER_UDP_OLD_DST_PORT
+#define VR_MPLS_OVER_UDP_DST_PORT       VR_MPLS_OVER_UDP_NEW_DST_PORT
 #define VR_MPLS_OVER_UDP_SRC_PORT       51000
 #define VR_MUDP_PORT_RANGE_START        49152
 #define VR_MUDP_PORT_RANGE_END          65535