This patch removes the 3 hardware handlers that currently exist
under dm as the functionality is moved to SCSI layer in the earlier
patches.

[jejb: removed more makefile hunks and rejection fixes]
Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com>
Acked-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>