massage the preferred path detection to happen when mpath asks for

a paths status, rather than on attach. the status it returns depends
on the type of device you have. hds provides two types of arrays,
symmetric and asymmetric.

on a symmetric device you can shove io down any path to any port
on any controller and it will work. on symmetric devices we say all
paths are part of the same group, and unconditionally return active
path status to any check request.

on asymmetric devices we group paths by which controller in teh
array they connect to. the controllers return whether theyre providing
a preferred path via a couple of status bits in a hds specific vpd
page, so we query that and return the state of the bits.

unfortunately hds arrays dont report change of lun ownership in any
way, so we dont currently have any way of failing over at the moment.
ill have to think about the least worst way to handle that.

tested by deraadt@ on hppa

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