update config sample, marshal tags from toml

etc/config.sample.toml

@@ -22,8 +22,11 @@
 # NOTE: The configuration has a few required parameters. They are marked
 # with 'required'. Be sure to edit those to make this configuration work.
 
+# OUTPUTS
+[outputs]
+
 # Configuration for influxdb server to send metrics to
-[influxdb]
+[outputs.influxdb]
 # The full HTTP endpoint URL for your InfluxDB instance
 url = "http://localhost:8086" # required.
 
@@ -35,11 +38,9 @@ database = "telegraf" # required.
 
 # Set the user agent for the POSTs (can be useful for log differentiation)
 # user_agent = "telegraf"
-# tags = { "dc": "us-east-1" }
 
 # Tags can also be specified via a normal map, but only one form at a time:
-
-# [influxdb.tags]
+# [tags]
 # dc = "us-east-1"
 
 # Configuration for telegraf itself