MPATH_SKIP_UNLESS_ISCSI(_sds, _num_sds) iterates over all _sds, and
skips the test unless all paths are iSCSI based.
Signed-off-by: David Disseldorp <ddiss@suse.de>
mpath_check_matching_ids() walks the list of scsi devices, and confirms
that all entries share one common device identification designator or
unit serial number.
Signed-off-by: David Disseldorp <ddiss@suse.de>