Add classification tag `config-file-all-comments` for template config files
The classification-only tag config-file-all-comments
tracks
configuration files in /etc that contain only comments and blank lines.
This is helpful for developers seeking to build minimal systems without
placeholder files, or developers looking to notice such placeholders and
move them to documentation examples.
As a classification-only tag, this is not intended to propose any changes or policy; it is only intended to gather information of use to developers.