Allow Plinth to manage network connections even when running as 'plinth'
user and not root user. This is done by adding polkit rules that
Network Manager checks
- Add new style Javascript based rules file for newer versions of
polkit (>105). This is not fuly tested.
- Add old style .pkla file for older versions of polkit (<=105).
Since we are running PAM update script from users action file, it is
appropriate for the PAM configurations that are effected by it to stay
here in Plinth as well.
