Allow to have an empty plugins list

[bfontaine]

Hello,

Is your feature request related to a problem? Please describe.
I’m trying not to have any plugin in the telegraf.conf file because I manage everything under telegraf.d, but if I use telegraf_plugins_default: [] the playbook includes this code:

# No plugins configured, added a mem plugin so telegraf doesn't stop working.
[[inputs.mem]]

I can’t find a way to have nothing here.

Describe the solution you'd like
A variable of some sort to disable the behavior of adding inputs.mem if there are no plugins.