Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC all change to makefs through r247052. Key functional changes
include:

r239562:
Add -p flag to create the image as a sparse file.

r242501:
If no contents keyword is specified, the default for files is
the named file.

r247041:
Add a -D flag that causes duplicate entries in an mtree manifest to be
treated as warnings rather than errors.

r247042:
Fix the -N option in manifest mode by using pwcache(3). This also
speeds up image creation appreciably.

r247043:
Allow '.' components in manifest paths. They are always the first
component of mtree -C and install -M output and are easily skipped.

r247052:
Support hardlinks in manifest files by the same logic as the treewalk
code.

MFC: r230795

Allow contents of multiple directories to be merged to the current image.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Sync makefs(8) ISO 9660 support with NetBSD:
o cd9960 -> cd9660
o Move inclusion of sys/endian.h from cd9660_eltorito.c to cd9660.h
since actual user is not cd9660_eltorito.c but iso.h and
cd9660_eltorito.h.

Actually, include order/place of sys/endian.h doesn't matter on
netbsd since it is always included by sys/types.h but it's not
true on other system. This should fix cross build breakage on
freebsd introduced by rev. 1.16 of cd9660_eltorito.c.
Problem reported and fix suggested on twitter.
o Fix fd leaks in error cases. Found by cppcheck.
o RRIP RE length should be 4, not 0
o Apply fixes for PR bin/44114 (makefs(8) -t cd9660 -o rockridge creates
corrupted cd9660fs), iso9660_rrip.c part:
- cd9660_rrip_finalize_node() should check rr_real_parent in node->parent,
not in node itself in RRIP_PL case
- cd9660_rrip_initialize_node() should update only node passed as arg
so handle RRIP_PL in DOTDOT case

Fixes malformed dotdot entries in deep (more than 8 level) directories
moved into .rr_moved dir.

Should be pulled up to netbsd-5.
(no official ISO has such deep dirs, but cobalt restorecd is affected)

Reviewed by: mm
Approved by: re (kib)
Obtained from: NetBSD
MFC after: 3 days

Add support for using mtree(5) manifest files to define the image
to be created. The support is based on mtree version 2.0, as used
in libarchive, but adds new features on top of it.

The current implementation is fully functional, but is envisioned
to grow at least the following additional features over time:
o Add support for the /include special command so that manifest
files can be constructed using includable fragments.
o Add support specifying a search path to locate content files.
o Content file filters: commands that provide file contents on
stdout.

The manifest file eliminates the need to first construct a tree
as root in order to create an image and allows images (releases)
to be created directly from object trees and/or source trees.

Reviewed by: deo
Sponsored by: Juniper Networks, Inc

Sync with the latest version from NetBSD. It notably addds ISO9660 support.

Submitted by: bapt