- 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

MFC r269867:
Update our stub resolver to final version of libbind
(libbind-6.0).

Obtained from: ISC

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

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

Upgrade res_update(3) and the friends to BIND9's one excluding TSIG
support.

X-MFC after: never

It's not enough to provide symbol map files; you also have to add them
to ${SYM_MAPS}. This unbreaks world with SYMVER_ENABLED.

Pointy hat to: ume

- Merge our local changes.
- Exclude unnecessary functions for us.