Move code that is used both by initiator and target drivers

Move the functions that are used by both the initiator and target
subsystems into scsi_common.c/.h. This change will allow to remove
the initiator SCSI header include directives from most SCSI target
source files in a later patch.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

diff --cc drivers/scsi/Makefile
Simple merge

diff --cc drivers/scsi/scsi.c
Simple merge

diff --cc drivers/scsi/scsi_common.c
Simple merge

diff --cc drivers/scsi/scsi_error.c
Simple merge

diff --cc drivers/scsi/scsi_scan.c
Simple merge

diff --cc include/scsi/scsi.h
Simple merge

diff --cc include/scsi/scsi_common.h
Simple merge

diff --cc include/scsi/scsi_device.h
Simple merge

diff --cc include/scsi/scsi_eh.h
Simple merge