The following tables are being added for the EVPN Feature.

This is in accordance with the HLD as part of the following PR.
sonic-net/SONiC#437

CONFIG DB

1. EVPN_NVO Table.

APP DB
1. EVPN_REMOTE_VNI Table.
2. VXLAN_FDB Table.

STATE DB
1. VXLAN_TUNNEL Table.

common/schema.h

@@ -38,6 +38,7 @@ namespace swss {
 #define APP_VXLAN_VRF_TABLE_NAME          "VXLAN_VRF_TABLE"
 #define APP_VXLAN_TUNNEL_MAP_TABLE_NAME   "VXLAN_TUNNEL_MAP_TABLE"
 #define APP_VXLAN_TUNNEL_TABLE_NAME       "VXLAN_TUNNEL_TABLE"
+#define APP_VXLAN_FDB_TABLE_NAME          "VXLAN_FDB_TABLE"
 #define APP_PASS_THROUGH_ROUTE_TABLE_NAME "PASS_THROUGH_ROUTE_TABLE"
 #define APP_ACL_TABLE_TABLE_NAME          "ACL_TABLE_TABLE"
 #define APP_ACL_RULE_TABLE_NAME           "ACL_RULE_TABLE"
@@ -210,6 +211,7 @@ namespace swss {
 
 #define CFG_VXLAN_TUNNEL_TABLE_NAME                 "VXLAN_TUNNEL"
 #define CFG_VXLAN_TUNNEL_MAP_TABLE_NAME             "VXLAN_TUNNEL_MAP"
+#define CFG_VXLAN_EVPN_NVO_TABLE_NAME               "EVPN_NVO"
 #define CFG_VNET_TABLE_NAME                         "VNET"
 #define CFG_NEIGH_TABLE_NAME                        "NEIGH"
 
@@ -251,6 +253,7 @@ namespace swss {
 #define STATE_NEIGH_RESTORE_TABLE_NAME              "NEIGH_RESTORE_TABLE"
 #define STATE_MIRROR_SESSION_TABLE_NAME             "MIRROR_SESSION_TABLE"
 #define STATE_VXLAN_TABLE_NAME                      "VXLAN_TABLE"
+#define STATE_VXLAN_TUNNEL_TABLE_NAME               "VXLAN_TUNNEL_TABLE"
 #define STATE_BGP_TABLE_NAME                        "BGP_STATE_TABLE"
 #define STATE_DEBUG_COUNTER_CAPABILITIES_NAME       "DEBUG_COUNTER_CAPABILITIES"
 #define STATE_NAT_RESTORE_TABLE_NAME                "NAT_RESTORE_TABLE"