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

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

Remove unused traceroute(8) contrib code from head

It still lives on under vendor/traceroute.

This commit was generated by cvs2svn to compensate for changes in r100784,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r18579,
which included commits to RCS files with non-trunk default branches.