[arch-general] cups 1.6.0 hitting testing

A major cups update hits testing. Cups has dropped native printer browsing support for Linux OS, you now need to run the avahi-daemon before you start cupsd. Make sure you also cleanup your cupds.conf. My server seems to print well. Clients can see the printers in the print dialog here. Please report broken stuff you may find to our tracker or upstream. Note: Please also test the systemd-socket patch. My server is running initscripts so I can't test it. It has become a mix of the Fedora and the Gentoo patch (no big differences). -Andy