Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove some more NetBSD compat shims and other unused bits from these
drivers:
- Remove scsi_low_pisa.*, they were unused.
- Remove <compat/netbsd/physio_proc.h> and calls to the stubs in that
header. They were empty nops.
- Retire sl_xname and use device_get_nameunit() and device_printf() with
the underlying device_t instead.
- Remove unused {ct,ncv,nsp,stg}print() functions.
- Remove empty SOFT_INTR_REQUIRED() macro and the unused sl_irq member.

Start each of the license/copyright comments with /*-

Move the non-MD machine/dvcfg.h and machine/physio_proc.h to a common
MI area before they proliferate more.

Don't include <sys/buf.h> needlessly.

Remove __P.

Gut this header; since physio_proc_init is never called, the code never does
anything more than multiply declare some unused variables.

Use queue macros.

Add PC-Card/ISA SCSI host adpater drivers from NetBSD/pc98
(a NetBSD port for NEC PC-98x1 machines). They are ncv for NCR 53C500,
nsp for Workbit Ninja SCSI-3, and stg for TMC 18C30 and 18C50.

I thank NetBSD/pc98 and bsd-nomads people.

Obtained from: NetBSD/pc98

Add $FreeBSD$

Changed `inline' to `__inline' so that this file can be compiled by
`gcc -ansi'.

Changed NULL to 0 so that this file is more self-sufficient (now
only <sys/types.h> is a prerequisite).

Moved include files which are independent of bs driver.