Introduce a basic way to interact with graphite/carbon.

Thin wrapper to send UDP data to chromeos-stats.

TEST=Sent data to graphite server as a test.
BUG=None

Change-Id: If474edc0a3875f654edc4cd5b114ed0c7137884d
Reviewed-on: https://gerrit.chromium.org/gerrit/42752
Commit-Queue: Scott Zawalski <scottz@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: Scott Zawalski <scottz@chromium.org>
diff --git a/global_config.ini b/global_config.ini
index ba6e3b0..38076b8 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -165,3 +165,7 @@
 
 lab_status_url: http://chromiumos-lab.appspot.com/current?format=json
 
+# carbon server feeding Graphite (chromeos-stats.corp.google.com)
+CARBON_SERVER: chromeos-stats.corp.google.com
+CARBON_PORT: 2003
+