- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r266981:
Overhaul CAM SG driver IOCTL interfaces.

Make it really work for native FreeBSD programs. Before this it was broken
for years due to different number of pointer dereferences in Linux and
FreeBSD IOCTL paths, permanently returning errors to FreeBSD programs.
This change breaks the driver FreeBSD IOCTL ABI, making it more strict,
but since it was not working any way -- who bother.

Add shims for 32-bit programs on 64-bit host, translating the argument
of the SG_IO IOCTL for both FreeBSD and Linux ABIs.

With this change I was able to run 32-bit Linux sg3_utils tools and simple
32 and 64-bit FreeBSD test tools on both 32 and 64-bit FreeBSD systems.

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

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

Provide the structures and ioctl number definition for handling
PCIOCGETCONF compat32.

Submitted by: John Wehle <john feith com>
MFC after: 2 weeks

Implement compat32 MEMRANGE_GET and MEMRANGE_SET. This is needed to
run 32bit Xorg server with VESA driver.

Submitted by: John Wehle <john feith com>
MFC after: 1 week

Emulate the FIODGNAME ioctl in our 32-bit emulator.

It's quite strange that nobody reported this issue before. It turns out
functions like ttyname(), ptsname() and fdevname() don't work in
compat32. This means it't not even possible to run applications like
script(1) inside a 32-bit FreeBSD jail.

Fix this by converting 32-bit fiodgname_arg structures to their 64-bit
equivalent.

Reported by: kris
Tested by: kris

Add freebsd32 compat shims for ioctl(2)
CDIOREADTOCHEADER and CDIOREADTOCENTRYS requests.

Add freebsd32 compat shims for ioctl(2)
MDIOCATTACH, MDIOCDETACH, MDIOCQUERY, and MDIOCLIST requests.