libvirt-tests: Add test for virsh nodedev-reset

Test command: virsh nodedev-reset <device>

When `device_option` is:
1) resettable   : Try to reset specified device if it is resettable.
2) non-exist    : Try to reset specified device which doesn't exist.
3) non-pci      : Try to reset all local non-PCI devices.
4) active       : Try to reset specified device which is attached to VM.
5) unresettable : Try to reset all unresettable PCI devices.

Signed-off-by: Hao Liu <hliu@redhat.com>