Add sudo class for the Telegraf agent

Change-Id: I5a28afdb2b7918beb91453e933a263edde003720
diff --git a/telegraf/agent/init.yml b/telegraf/agent/init.yml
index 0e836e8..3f6133d 100644
--- a/telegraf/agent/init.yml
+++ b/telegraf/agent/init.yml
@@ -1,5 +1,6 @@
 classes:
 - service.telegraf.agent
+- system.telegraf.sudo
 parameters:
   telegraf:
     agent: