fix printer sharing with osx shadow servers

[totaam]

Issue migrated from trac ticket # 1170

component: platforms | priority: major | resolution: fixed | keywords: osx shadow printing

2016-04-16 08:54:10: antoine created the issue

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See #391#comment:12 and r12397.

[totaam]

2016-07-12 17:51:51: antoine commented

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Milestone renamed

[totaam]

2016-08-21 10:55:50: antoine commented

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Milestone renamed

[totaam]

2017-02-18 17:04:11: antoine changed status from new to closed

[totaam]

2017-02-18 17:04:11: antoine set resolution to fixed

[totaam]

2017-02-18 17:04:11: antoine commented

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macos is not really Unix then: r15116. (will backport)

Then after a lot of digging (and using cupsctl --debug-logging), I found that the cups backend could not execute any commands... this requires a system configuration change now documented here: [/wiki/Printing?action=diff&version=22]