Disable not used metrics exposed per cpu

Change-Id: Ie3f9da382c23148836e4a20ff0f37c3929e062cf

linux/meta/telegraf.yml

@@ -1,7 +1,7 @@
 agent:
   input:
     cpu:
-      percpu: true
+      percpu: false
       totalcpu: true
     disk:
     diskio: