Update expected exception for missing ports
Update expected exception for missing ports

In some cases, we're ignoring exceptions caused by missing ports.
os-win is not really consistent with the exceptions it raises, for
which reason we have to loosen the caught excepton class a bit.

This would be caused mostly because of wmi object caching, which may
lead to some false positives when looking up ports.

Change-Id: I501fa15f0f0157d54170902e36ceff7fbd7b151b
Trace: http://paste.openstack.org/raw/734490/
Related-Bug: #1794975

openstack/networking-hyperv,stackforge/networking-hyperv,openstack/networking-hyperv