iPhone USB tethering support

Hi,

Quick tests let me think that USB tethering with iPhones and tails may not be functionnal.

Its especially problematic, considering that sharing a phone connection with USB tethering can be a good workaround (*) when Wifi is not working with Tails : lot of recent Macs seems to have the problem and their users may be more likely to own iPhones.

When you try to activate USB tethering on an iPhone, the phone prints instructions about installing iTunes on the computer. Quick research let me think that adding a few additionnal packages (usbmuxd, libimobiledevice) may solve the problem, in the same way than additional packages may have been necessary for MTP support.

Refs: https://wiki.debian.org/iPhone & https://wiki.archlinux.org/index.php/IPhone_tethering

(*) with limitations for the Mac spoofing feature etc :(.

Feature Branch: geb:feature/16180-iphone-tethering-support

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Original created by @geb on 16180 (Redmine)

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