Cleaned up template file to make it much shorter…

[stefanhorning]

…and contain less non unicode characters too.

Before this changes:

grep -r --color='auto' -P -n "[^\x00-\x7f]" templates/

templates/telegraf.conf.j2:71:  ## Valid time units are "ns", "us" (or "µs"), "ms", "s".
templates/telegraf.conf.j2:1361:#   ## This collect all heap memory usage metrics.
templates/telegraf.conf.j2:1367:#   ## This collect thread counts metrics.
templates/telegraf.conf.j2:1373:#   ## This collect number of class loaded/unloaded counts metrics.

After them:

grep -r --color='auto' -P -n "[^\x00-\x7f]" templates/
[no results]