libxl: Do not trust backend for vusb

libxl: Do not trust backend for vusb

Read the type from /libxl, rather than the backend.  (We still trust
the backend for details such as the number of ports, etc.; these are
not a security problem.)

In getinfo, use the computed frontend path, and the incoming domid,
rather than needlessly reading these values from the backend.

This is part of XSA-178.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
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v2: New patch following rebase.