Trim out the CUPS-supplied prefix for the printer serial number
Make colord polkit policy usable on servers

The polkit policy should allow admin users logged in via ssh or Cockpit (for
example on a server) to perform the actions in question, although requiring the
admin credentials.  The <allow_any> applies non local sessions.

Resolves: https://github.com/hughsie/colord/issues/5

Signed-off-by: Richard Hughes <richard@hughsie.com>