Update expected code for http_response

Change-Id: I1c6cc0944314a3101e0126358edaba5bc7b62434
diff --git a/glance/meta/telegraf.yml b/glance/meta/telegraf.yml
index 11d6b0d..bdacc59 100644
--- a/glance/meta/telegraf.yml
+++ b/glance/meta/telegraf.yml
@@ -5,4 +5,5 @@
     http_response:
       glance-api:
         address: "http://{{ server.bind.address|replace('0.0.0.0', '127.0.0.1') }}:{{ server.bind.port }}/"
+        expected_code: 300
 {%- endif %}
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