Explicit owner and mode for config files

[groggemans]

Had an issue with nomad not starting because I had a custom create mask set up for improved security.

Updated the role to use explicit mode and user/group for config files. Because all files in /etc are usually owned by root I split-off the config directory creation so it's also owned by root.

[brianshumate]

Thanks! 👍

[groggemans]

Oops, looks like I forgot to add the leading zero's of the modes.. creating a fix asap