Add attributes to various basic modules (#5964)
* Add attributes to various basic modules.
* Check and diff mode for pam_limits was added in #830.
(cherry picked from commit 9de145482b)
Co-authored-by: Felix Fontein <felix@fontein.de>
* gconftool2: refactored to use ModuleHelper + CmdRunner
* add changelog fragment
* removed old code commented out
(cherry picked from commit 6c7e9116e1)
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>