- 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

Somehow this got replicated too many times

Approved by: cperciva (implicit)

Add a clean-room reimplementation of a script originally
found in openssh's contrib directory.

This version has more features and is better written.
I intend to submit this upstream as well.

Reviewed by: bapt
Reviewed by: des
Approved by: cperciva
MFC after: 1 week