MFC r271480, r271483, r271491, r276765, r276766, r276820,

MFC r271480, r271483, r271491, r276765, r276766, r276820,
r276822, r276827, r276828:

r271480:
  Set PKG_CACHEDIR to an 'All/' directory one level lower
  to fix 'pkg repo' generating repository metadata for the
  on-disc packages.

r271483:
  Fix duplicate PKG_ABI in the PKG_CACHEDIR path.

r271491:
  Simplify dvd package population with pkg-1.3.

r276765:
  Update pkg-stage.sh to be compatible with pkg-1.4.x.

  In 1.3.x and earlier, ABI format is, for example,
  freebsd:11:x86:64.

  In 1.4.x, ABI format is FreeBSD:11:amd64, and a new
  configuration entry, ALTABI, is: freebsd:11:x86:64.

  Export PKG_ABI and PKG_ALTABI accordingly, and if
  PKG_ALTABI is set, create a symlink within the dvd
  PKG_CACHEDIR so both new and old ABI directories
  exist.

r276766:
  Properly change directories before creating the
  PKG_ALTABI -> PKG_ABI symlink.

r276820:
  Print informational output when NOPORTS is set,
  which would otherwise cause pkg-stage.sh to
  silently exit.

r276822:
  Ensure /var/run/ld-elf.so.hints exists before building
  pkg(8).

r276827:
  Ensure the ports directories exist for the list of
  packages intended to be included on the DVD, and
  remove any nonexistent ports from the final list.

  Print the list of missing paths, and ensure that
  DVD_PACKAGES is non-zero length (which should never
  happen).

r276828:
  Switch to x11/gnome3 now that x11/gnome2 no
  longer exists in the ports tree.

Sponsored by:	The FreeBSD Foundation

git-svn-id: svn://svn.freebsd.org/base/stable/9@276954 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f