MFC

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 imp

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

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Sync: merge r214895 through r215140 from ^/head.

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

Submitted by: bapt

Merge from head up to r188941 (last revision before the USB stack switch)

MFH @ 186335

fix pathnames to work w/ buildworld

import netbsd makefs tool

MFH @ 186335

fix pathnames to work w/ buildworld

import netbsd makefs tool