Add a patch to print/cups and print/hplip to disable detaching of ulpt(4).
This isn't needed on FreeBSD and it always fails because the process doesn't
have the required privileges.
Add a sample devd configuration file to print/cups that gives users in group
cups access to USB printers. [1]
Submitted by: hselasky, Alexander Zagrebin <alex@zagrebin.ru> [1]