device parsing, add debug print
device parsing, add debug print

  Sometimes libvirt will fail in these APIs if there is low level error,
what we saw is libvirt can't got xml for some domain. This patch adds
debug log when met this error, so in future we can know what is wrong.

Signed-off-by: Wenchao Xia <a82bded1b492a49d76e42d0788520e04e9fbf126@linux.vnet.ibm.com>
Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

libvirt/libvirt-cim,libvirt/libvirt-cim,libvirt/libvirt-cim