virt-aa-helper: fix libusb access to udev usb data

virt-aa-helper: fix libusb access to udev usb data

libusb as used by qemu needs to read data from /run/udev/data/ about usb
devices. That is read once on the first initialization of libusb_init by
qemu.

Therefore generating just the device we need would not be sufficient as
another hotplug later can need another device which would fail as the
data is no more re-read at this point.

But we can restrict the paths very much to just the major number of
potential usb devices which will make it match approximately the detail
that e.g. an lsusb -v would reveal - that is much safer than the
"/run/udev/data/* r" blanket many users are using now as a workaround.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>