sbin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

sbin: normalize paths using SRCTOP-relative paths or :H when possible

This simplifies make logic/output

MFC after: 1 month
Sponsored by: Dell EMC Isilon

Explicitly add more files to the 'runtime' package.

Sponsored by: The FreeBSD Foundation

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

MFC r200135:

Make umount(8) WARNS=6 clean:
- Cast delimiter width to integer [1]
- Solve name conflicts against system header
- Constify parameters to avoid qualifier conflict

PR: bin/140017 [1]
Submitted by: Ulrich Spörlein <uqs spoerlein net> [1]
Sponsored by: iXsystems, Inc

Make umount(8) WARNS=6 clean:
- Cast delimiter width to integer [1]
- Solve name conflicts against system header
- Constify parameters to avoid qualifier conflict

PR: bin/140017 [1]
Submitted by: Ulrich Spörlein <uqs spoerlein net> [1]
MFC after: 1 month
Sponsored by: iXsystems, Inc

- Import the HEAD csup code which is the basis for the cvsmode work.

style.Makefile(5):
Use WARNS?= instead of WARNS=.

Remove one of two WARNS=0.

Default to WARNS=2.
Binary builds that cannot handle this must explicitly set WARNS=0.

Reviewed by: mike

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Set the default manual section for sbin/ to 8.

Finish up umntall support. init now passed an argument to the
rundown script 'reboot' or 'single'. ISO support (which never
worked) has been removed from mount_nfs. mount_nfs and umount
now use mounttab, which allows umntall to work properly. The
rc scripts now call umntall as appropriate.

Submitted by: Martin Blapp <mb@imp.ch>

Removed definition of _NEW_VFSCONF. The new vfsconf interface is now
the default.

Merge from Lite2.
- use new getvfsbyname() interface.
- new -A option, like -a except only mounted file systems are unmounted.

All non-cosmetic FreeBSD changes in umount.c, except ignoring of
realpath() failures, went away because they are done better in Lite2.
realpath() failures must be ignored so that non-pathnames like
"<above>:/foo" and "host:/bar" get as far as mount(2).

Reviewed by: dfr

Import some CSRG 4.4BSD-Lite2 components for sbin onto vendor branch.
(note that some of these have already been imported, this is a no-op)

Delete obsolete references to librpc.a.

Convert to our man installation style. Also fixed long-standing bug
in `fastboot'/`fasthalt' in which the interpreter would hang around
after `reboot' or `halt' is run, causing an irritating ``Killed'' message.

BSD 4.4 Lite sbin Sources

Note: XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.