Revert "Fix legacy URL tag."

Breaks deployment with older collectd
This reverts commit f9fbf18ca70be4db576f3032588b7a82cc5adc8d.

Change-Id: I16d6ccb2e6a966c256ed6b40b311c1b1b3139876
diff --git a/collectd/files/backend/http.conf b/collectd/files/backend/http.conf
index 3bc1bc5..8787dbc 100644
--- a/collectd/files/backend/http.conf
+++ b/collectd/files/backend/http.conf
@@ -3,12 +3,11 @@
 </LoadPlugin>
 
 <Plugin write_http>
-  <Node>
-    URL "http://{{ backend.host }}:{{ backend.port }}"
+  <URL "http://{{ backend.host }}:{{ backend.port }}">
     Format "{{ backend.get('format', 'json')|upper }}"
     StoreRates {{ backend.get('store_rates', True)|lower }}
 {%- if backend.timeout is defined %}
     Timeout {{ backend.timeout }}
 {%- endif %}
-  </Node>
+  </URL>
 </Plugin>