Merge changes I804a0ba0,I5667cbb4,Ic2c85f3c

* changes:
  [NFCT.NS.11] Add NAT conntrack event notification
  [NFCT.NS.10] Parse CTA_TUPLE_PROTO
  [NFCT.NS.9] Parse CTA_TUPLE_ORIG and CTA_TUPLE_REPLY