- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
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

libc: Make various internal file descriptors from fopen() close-on-exec.

Add Aerospace Corporation copyrights to EUI64 support files.

Suggested by: marcel, imp

Add support for an /etc/eui64 file modeled on /etc/ethers. The API is
modeled on ethers(3) except that all functions are thread-safe.

Reviewed by: simokawa