libxl: Do not trust backend for nic in list

libxl: Do not trust backend for nic in list

libxl_device_nic_list should use the /libxl path to search for
devices, and for obtaining the device information.

The "type" parameter was always "vif".  Abolish it.  (In any case,
paths in /libxl/device are named after the frontend type which is
constant, not the backend type which might in future vary.)

Abolish a redundant store to pnic->backend_domid.  Before this commit,
that store was not needed because libxl_device_nic_init (called by
libxl__device_nic_from_xenstore) would zero it.  Now it overwrites the
correct backend domid with zero; so remove it.

This is part of XSA-178.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>