[ONOS-6208]Implemention of onos and loxi for OVS NAT and connection tracking support

Change-Id: I782422d41fdacc805b523b57c3bd0b6e67e483a2
diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/ExtensionSelectorType.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/ExtensionSelectorType.java
index f65c168..e9715a6 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/ExtensionSelectorType.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/ExtensionSelectorType.java
@@ -39,6 +39,10 @@
         NICIRA_MATCH_NSH_CH3(4),
         NICIRA_MATCH_NSH_CH4(5),
         NICIRA_MATCH_ENCAP_ETH_TYPE(6),
+        NICIRA_MATCH_CONNTRACK_STATE(7),
+        NICIRA_MATCH_CONNTRACK_ZONE(8),
+        NICIRA_MATCH_CONNTRACK_MARK(9),
+        NICIRA_MATCH_CONNTRACK_LABEL(10),
         OFDPA_MATCH_VLAN_VID(16),
         OFDPA_MATCH_OVID(17),
         OFDPA_MATCH_MPLS_L2_PORT(18),