- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Merge ntpd & friends 4.2.4p5 from vendor/ntp/dist into head. Next commit
will update usr.sbin/ntp to match this.

MFC after: 2 weeks

Import ntp 4.2.4p5 in the vendor code area. Far too many changes to list here,
please see CommitLog for detailed changes.

XXX html/build/hints/solaris.xtra.4095849 is not being imported as it conflicts
with the detect-merge-conflict.sh script in our repo.