support for Ping and traceroute for IPV6 packet
support for Ping and traceroute for IPV6 packet

ipv6 adresses is swaped instead of contentent in the adress.
that is the reason Source & destination pointing same.

Change-Id: I5b41b624ab9d4c5903b7eceb7dfe5568e1462035
Partial-Bug: #1613999

nischalsheth/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller