Increase interval for disk reads on compute nodes from 10 to 60s

Telegraf is reporting a lot of errors like Jul 29 13:29:26 m3a015 telegraf: 2020-07-29T03:29:26Z W! [agent] [inputs.disk] did not complete within its interval because of the sheer number of homedirs mounted on the compute nodes. Hopefully, this will now complete within 60 seconds.