Update expected code for http_response

Change-Id: I4c84cf7a09e3d9d3c2201f7fc863edffde837707
diff --git a/neutron/meta/telegraf.yml b/neutron/meta/telegraf.yml
index d152967..86c317a 100644
--- a/neutron/meta/telegraf.yml
+++ b/neutron/meta/telegraf.yml
@@ -5,4 +5,5 @@
     http_response:
       neutron-api:
         address: "http://{{ server.bind.address|replace('0.0.0.0', '127.0.0.1') }}:{{ server.bind.port }}/"
+        expected_code: 200
 {%- endif %}