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

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

Use __FBSDID vs. rcsid[].

$Id$ -> $FreeBSD$

Resolve conflicts.

This commit was generated by cvs2svn to compensate for changes in r26206,
which included commits to RCS files with non-trunk default branches.

Hold onto your hats folks, here it comes: the first stage of the
Secure RPC import I've been threatening.

This step adds some necessary protocol definition files and headers to
rpcsvc, including the ones needed for NIS+.

Reviewed by: Mark Murray