[Feature request] "labkey ssh" access to a bridge as well besides a physical interface

[Taihsiang Ho]

The current d05-2 node uses a bridge (of a physical interface) as the main PXE port. This configuration may result in the failure of "labkey ssh" smart connection[1].

We may enhance labkey to pick up the corresponding IP information of bridge and physical interface both, rather than re-configure d05-2 "back to normal" every time.

[1] labkey ssh d05-2 (after d05-2 is deployed) will raise Traceback:

Traceback (most recent call last):
  File "./labkey", line 401, in <module>
    m.ssh()
  File "./labkey", line 309, in ssh
    ip = machine.boot_interface.links[0].ip_address
  File "/home/tai271828/.local/share/virtualenvs/canonical-server-hwe-utils-q1W0WnoQ/lib/python3.8/site-packages/maas/client/viscera/__init__.py", line 566, in __getitem__
    return self._items[spec]
IndexError: list index out of range