- 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 r283547:

Ensure that all arm kernel configs contain ALT_BREAK_TO_DEBUGGER and not
BREAK_TO_DEBUGGER if they have a serial console (most do). A burst of
serial line noise (such as unplugging a usb serial adapter) can look like
a break and drop a working system into the debugger. The alt break sequence
(<CR>~^B) works fine on both serial and non-serial consoles.

MFC r279837:

Remove MODULES_OVERRIDE="" and WITHOUT_MODULES="ahc" from armv6 configs.

MFC r276004: Fix the indentation to simplify comparing the ARM config files.

MFC r276003:

Start to clean up the armv6 kernel configs by reducing the diff between
them in the first sections and the later FDT support.

MFC r266647, r270912, r273089:

Reduce the diff between the PandaBoard and BeableBone kernel configs

Resync comments about scbus and pass for life after AHCI joined CAM.

Uncomment general options from the Pandaboard config. These are in other
configs and there is no reason for them not to be here.

MFC 265155, 265254:

Omit from the universe build all config files tagged with #NO_UNIVERSE.

Add FDT to the VYBRID kernel.

Omit from the universe build all config files tagged with
#NO_UNIVERSE. Many of these config files are important examples, but
add little to no regresive value to the intended purpose of
UNIVERSE. We now build over 120 kernels during universe. There's
really little to no value to this over building say 60 or even 30 of
them (either is still a way too big number). This is especially true
for kernels that are nothing more than including a common base and
adding a static DTB file. Start by pruning 1/3 of the arm kernels that
add little regresion value.

In kernel config files, it is supposed to be 'options<space><tab>' not
'options<tab><tab>', per long standing (but recently not so strictly
enforced) convention.

Make all the comments '# ' and align to same column. This fixes the
rampently incosnsitent usage which made cut and paste from one file
to another look ugly.

Strip arm/conf/DEFAULTS down to just items that are mandatory for running
the architecture. Move the other contents into each of the individual
config files.

Requested by: imp

Add option TMPFS to arm/conf/DEFAULTS, remove it from the few configs
that have it individually. Concensus on freebsd-arm@ is that it should
be included in all ARM kernels.

Add driver for Inter-Integrated Circuit (I2C).

Disable debugging by default.

Add driver for Display Control Unit (DCU4).

Split kernel configuration to chip common and board specific parts.