scsi_dh update

Hi James,

this is the (hopefully final) update to my scsi_dh patchset.
Features are:

- Move device-table matching into the device_handler infrastructure,
 so that individual drivers don't have to implement it themselves
- Adds a 'dh_state' sysfs attribute for manually attaching device
 handler to new or unknown disks; this allows to override the
 internal device tables
- Update the dm-multipath code to attach the device handler
 specified in the multipath configuration
- Add a cache to speed up lookup of several identical devices
- Update existing EMC, RDAC, and hp_sw device handler to use
 the new infrastructure
- Add new SPC-3 ALUA device handler

The NetApp device handler has been left out for now as it's still
under development.

Please apply.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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