Update scsi_dh infrastructure

Hi all,

this patchset updates the scsi_dh infrastructure as posted
by Chandra Seetharman
recently.

Main changes are to switch to a single notifier callback
instead of a per-handler
one and adding a sysfs attribute which allow to control the
device handler
manually. Quite useful for testing.

I've converted all handlers for the new infrastructure; in
addition I've updated
all handlers (except RDAC, Hi Chandra!) to refuse to attach
to a device which
does _not_ support the appropriate method.
Except hp_sw, that is, as I didn't found a way of reliably
detect this.

And I've added a generic SPC-3 ALUA handler.

Cheers,

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

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