Add routing rule table for DASH (#668)

* Add DASH_ROUTE_RULE_TABLE to APP DB

Author: prabhataravind

common/schema.h

@@ -146,6 +146,7 @@ namespace swss {
 #define APP_DASH_ROUTING_TYPE_TABLE_NAME    "DASH_ROUTING_TYPE_TABLE"
 #define APP_DASH_APPLIANCE_TABLE_NAME       "DASH_APPLIANCE_TABLE"
 #define APP_DASH_ROUTE_TABLE_NAME           "DASH_ROUTE_TABLE"
+#define APP_DASH_ROUTE_RULE_TABLE_NAME      "DASH_ROUTE_RULE_TABLE"
 #define APP_DASH_VNET_MAPPING_TABLE_NAME    "DASH_VNET_MAPPING_TABLE"
 
 /***** TO BE REMOVED *****/