VxLAN Tunnel Counters and Rates implementation (#519)

* Changes for Tunnel counters

Author: dgsudharsan

common/schema.h

@@ -137,6 +137,8 @@ namespace swss {
 #define COUNTERS_MACSEC_NAME_MAP            "COUNTERS_MACSEC_NAME_MAP"
 #define COUNTERS_DEBUG_NAME_PORT_STAT_MAP   "COUNTERS_DEBUG_NAME_PORT_STAT_MAP"
 #define COUNTERS_DEBUG_NAME_SWITCH_STAT_MAP "COUNTERS_DEBUG_NAME_SWITCH_STAT_MAP"
+#define COUNTERS_TUNNEL_TYPE_MAP            "COUNTERS_TUNNEL_TYPE_MAP"
+#define COUNTERS_TUNNEL_NAME_MAP            "COUNTERS_TUNNEL_NAME_MAP"
 
 #define COUNTERS_NAT_TABLE              "COUNTERS_NAT"
 #define COUNTERS_NAPT_TABLE             "COUNTERS_NAPT"
@@ -172,8 +174,10 @@ namespace swss {
 #define PG_COUNTER_ID_LIST              "PG_COUNTER_ID_LIST"
 #define PG_ATTR_ID_LIST                 "PG_ATTR_ID_LIST"
 #define RIF_COUNTER_ID_LIST             "RIF_COUNTER_ID_LIST"
+#define TUNNEL_COUNTER_ID_LIST          "TUNNEL_COUNTER_ID_LIST"
 #define SWITCH_DEBUG_COUNTER_ID_LIST    "SWITCH_DEBUG_COUNTER_ID_LIST"
 #define MACSEC_SA_ATTR_ID_LIST          "MACSEC_SA_ATTR_ID_LIST"
+#define TUNNEL_ATTR_ID_LIST             "TUNNEL_ATTR_ID_LIST"
 #define PLUGIN_TABLE                    "PLUGIN_TABLE"
 #define LUA_PLUGIN_TYPE                 "LUA_PLUGIN_TYPE"
 #define SAI_OBJECT_TYPE                 "SAI_OBJECT_TYPE"
@@ -186,6 +190,7 @@ namespace swss {
 #define PORT_PLUGIN_FIELD                   "PORT_PLUGIN_LIST"
 #define RIF_PLUGIN_FIELD                    "RIF_PLUGIN_LIST"
 #define PG_PLUGIN_FIELD                     "PG_PLUGIN_LIST"
+#define TUNNEL_PLUGIN_FIELD                 "TUNNEL_PLUGIN_LIST"
 #define BUFFER_POOL_PLUGIN_FIELD            "BUFFER_POOL_PLUGIN_LIST"
 #define FLEX_COUNTER_STATUS_FIELD           "FLEX_COUNTER_STATUS"
 #define FLEX_COUNTER_GROUP_TABLE            "FLEX_COUNTER_GROUP_TABLE"