- 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

According to the NetBSD foundation [1]:

Third parties are encouraged to change the license on any files which have
a 4-clause license contributed to the NetBSD Foundation to a 2-clause
license. We would also encourage you to inform us about these files, so
that we can continue to track the many places in which NetBSD is used.

http://www.netbsd.org/about/redistribution.html#why2clause [1]

Requested by: joel@

Incorporate recent changes from NetBSD. Most notable change is the addition
of support of decompressing xz files.

Obtained from: NetBSD