- 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)

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

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

Initial device tree source (DTS) files for Marvell ARM systems:

o DB-88F5182
o DB-88F5281
o DB-88F6281
o DB-78100
o SheevaPlug

This also includes device tree bindings definitions for some newly introduced
nodes (mpp, gpio).

Reviewed by: imp
Sponsored by: The FreeBSD Foundation