- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

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

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

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

Remove incomplete support for running FreeBSD userland on old NetBSD kernels
lacking the issetugid() and utrace() syscalls.

- Introduce a new struct xvfsconf, the userland version of struct vfsconf.
- Make getvfsbyname() take a struct xvfsconf *.
- Convert several consumers of getvfsbyname() to use struct xvfsconf.
- Correct the getvfsbyname.3 manpage.
- Create a new vfs.conflist sysctl to dump all the struct xvfsconf in the
kernel, and rewrite getvfsbyname() to use this instead of the weird
existing API.
- Convert some {set,get,end}vfsent() consumers to use the new vfs.conflist
sysctl.
- Convert a vfsload() call in nfsiod.c to kldload() and remove the useless
vfsisloadable() and endvfsent() calls.
- Add a warning printf() in vfs_sysctl() to tell people they are using
an old userland.

After these changes, it's possible to modify struct vfsconf without
breaking the binary compatibility. Please note that these changes don't
break this compatibility either.

When bp will have updated mount_smbfs(8) with the patch I sent him, there
will be no more consumers of the {set,get,end}vfsent(), vfsisloadable()
and vfsload() API, and I will promptly delete it.

Fix SCM ID's.

Compensate for "Compensate for header dethreading" by backing it out.

Compensate for header dethreading.

$Id$ -> $FreeBSD$

Removed unused include of <kvm.h>. It was alarming for libc to apparently
depend on libkvm.

Removed obsolete `#define _NEW_VFSCONF'.

getvfsbyname() doesn't existing NetBSD, so return ENOSYS if compiled
into a library with __NETBSD_SYSCALLS defined.

Enabled the Lite2 getvfsbyname(). It's actually named new_getvfsbyname()
for now so that we don't lose library compatibility. Applications should
define _NEW_VFSCONF and use getvfsbyname() instead of new_getvfsbyname()
if they want the new vfsconf interface. Parts of the old interface
(enough to load vfs modules, I hope) are still available.

This commit was generated by cvs2svn to compensate for changes in r23291,
which included commits to RCS files with non-trunk default branches.

Attempt to import Lite2's getvfsbyname.c.