With the recent update to telegraf's container image it now runs under its own user and thus we need to change the permissions to make the config file accessible for the new user. See https://github.com/influxdata/influxdata-docker/pull/536
This will make it easier to migrate to other systems that do not have python2 etc installed
This patch reduces the permissions on the install directory to just the root user and also fixes the ansible-lint issue by specifying the `mode`.
