Update telegraf config to parse /proc/net/softnet_stat details

Hi Chris,

Can you please pick a node to test this new config on and tell me how it goes?

roles/telegraf/templates/telegraf.conf.j2

@@ -140,7 +140,7 @@
   ]
   data_format = "influx"
   timeout="4s"
-  interval="60s"
+  interval="600s"
 
 # Both Slurm ManagementNodes will log sdiag stats, but no Compute or Login nodes will
 {% if 'ManagementNodes' in group_names %}