SDHostNode: handle invalid bay_identifier attribute (fixes #7) (#8)
SDHostNode: handle invalid bay_identifier attribute (fixes #7) (#8)

Any attempt to read the bay_identifier sysfs file returns EINVAL for some
sas_end_devices, it seems. Handle this case in sas_counters.py by catching the
corresponding exception.
stanford-rc/sasutils,stanford-rc/sasutils