bug#63198: cups-service-type uses PAM-enabled 'cups' by default which prevents authentication

[Ricardo Wurmus]

I’ll second muradm: these changes broke my printing setup:

* my printer is no longer found because cups-minimal has minimal
  features and does not include dnssd
* I cannot add a new printer with ipp://192.168.x.x manually because of
  authentication problems.  The logs tell me that cups-brf needs to run
  as root.

As a bonus problem I cannot restart Cups with the “cups” package because
it cannot be killed.  I disabled the “cups” service and stopped it, but
cups still runs; killing it is of no use because it’s respawned
immediately.  Shepherd says it didn’t do it.  I also tried deleting the
cups socket file, but that also didn’t help.

-- 
Ricardo