use libusb auto-detach feature #84
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The
usbtransport was unconditionally detaching the kernel driver for an interface when claiming it (when supported), but wasn't re-attaching it when releasing the interface. As a result, a USB controller would stop being visible to the kernel after using this transport on Linux.This PR uses
libusb's auto-detach feature, which will automatically detach, the re-attach, the kernel driver when the interface is claimed then released.