Bug#979177: cups-filters-core-drivers: Adding a printer impossible because "driverless" is too slow

[Till Kamppeter <till.kamppeter@gmail.com>]

I have investigated the problem further and the problem is caused by 
"driverless" sending get-printer-attributes IPP requests to each printer 
it lists, to check the quality of driverless printing support. See

https://github.com/OpenPrinting/cups-filters/pull/235

This makes "driverless" taking too long time, especially if there are 
many printers. See the investigations on

https://github.com/OpenPrinting/cups/issues/65

Therefore I have removed the feature again now, on both master and 1.x 
branches of cups-filters:

https://github.com/OpenPrinting/cups-filters/commit/3fddcf5

https://github.com/OpenPrinting/cups-filters/commit/aae86d2

Please test, this should solve your problem.

I will release cups-filter 1.28.7 soon, with this change included.