template/prod.yml: add production logging parameters
template/prod.yml: add production logging parameters

the max-files and max-size rotation parameters are tuned to
accomodate ~0.4GB logs per service per week (assuming 200 devs/30 min polling intvl).

we're using the default json-file driver so its not explicitly setup.

Issues: MEN-946

Signed-off-by: mchalczynski <3a897b56ed6fc284ae11e3e7ec3ea48d098a7178@rndity.com>

GregorioDiStefano/integration,pasinskim/integration,pasinskim/integration,GregorioDiStefano/integration,pasinskim/integration