This patch converts scsi core to use the module_param interfaces
(except for the hosts.c scsihosts usage).

With this applied, boot time (non-module) command line setting of scsi
parameters must be prefixed by what the scsi module name would be
(scsi_mod), for example:

	scsi_mod.scsi_logging_level=0x180 scsi_mod.scsi_default_dev_flags=0x1
	scsi_mod.max_scsi_luns=5

Usage of scsi_mod as above is a bit ugly and long - if this patch is
applied, we should consider renaming scsi.c to scsi_main.c or similiar,
and scsi_mod.o to scsi.o. Or, somehow get our prefix set to "scsi".