MFC r314833
Convert absolute links to relative links.
Style.Makefile(9) has been ignored to produce minimal diffs.

MFC r314837
The relative symlink fix causes downstream issues for
EMC DELL Isilon so revert the relative symlink fix
pending a better solution.

Reported by: ngie

MFC r315091
Revert r314833 until the problem with INSTALL_RSYMLINKS can be found
as it appears to break arm release builds.

PR: 217705
Reported by: cyclaero@gmail.com

Approved by: grehan (mentor)

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

NOSHARED -> NO_SHARED

When nologin(8) is installed in /usr/sbin/, create a symlink from
/sbin/nologin for compatibility purposes. Also, remove the NO_NOLOGIN_LOG
option; we don't need to worry about conserving space as much on the /usr
partition.

Note that usr.sbin/nologin is not yet hooked up to the build.

Forced commit to note that files have been repocopied from
src/sbin/nologin to src/usr.sbin/nologin in preparation for
moving nologin(8) from /sbin to /usr/sbin.

Report login attempts to syslog. Due to the statically-linked nature of
nologin(8), this causes a considerable (100K) increase in the binary size,
so I've added a NO_LOGIN_LOG option which disables this.

While I'm here, s/sizeof(MESSAGE)/sizeof(MESSAGE) - 1/, in order to
avoid writing the string-terminating zero byte.

No complaints from: -current
Approved by: rwatson (mentor)

Reimplement nologin(8) as a C program. This allows us to statically
link it at low cost and avoid environment poisoning attacks associated
with LD_LIBRARY_PATH.

Suggested by: rwatson

beforeinstall -> SCRIPTS.

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

/sbin -> ${BINDIR}

Now that we have a manpage, don't have the 'clean' target be a NO-OP.

A manpage. May be the file nologin.5 should located in
src/share/man/man5.

Change `install' to `${INSTALL}' so that default install flags can be
specified in the top level Makefiles.

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.