added dns router

kong/api/routes/dns.lua

@@ -0,0 +1,23 @@
+local kong = kong
+
+
+return {
+  ["/status/dns"] = {
+    GET = function (self, db, helpers)
+
+      if kong.configuration.legacy_dns_client then
+        return kong.response.exit(501, {
+          message = "not implemented with the legacy DNS client"
+        })
+      end
+
+      return kong.response.exit(200, {
+        worker = {
+          id = ngx.worker.id() or -1,
+          count = ngx.worker.count(),
+        },
+        stats = kong.dns.stats(),
+      })
+    end
+  },
+}