collectd opentsdb brackets

added brackets to collectd and opentsdb for compatibility with 0.13

templates/influxdb.conf.j2

@@ -195,7 +195,7 @@ reporting-disabled = {{ influxdb_disable_reporting }}
 ### Controls the listener for collectd data.
 ###
 
-[collectd]
+[[collectd]]
   enabled = {{ influxdb_collectd_enabled }}
   bind-address = ":{{ influxdb_collectd_port }}"
   database = "{{ influxdb_collectd_database }}"
@@ -211,7 +211,7 @@ reporting-disabled = {{ influxdb_disable_reporting }}
 ### Controls the listener for OpenTSDB data.
 ###
 
-[opentsdb]
+[[opentsdb]]
   enabled = {{ influxdb_opentsdb_enabled }}
   # bind-address = ":{{ influxdb_opentsdb_port }}"
   # database = "{{ influxdb_opentsdb_database }}"