MFreleng10 r259582 (reverse), MFstable10 r259491, r259492, r260781:

MFreleng10 r259582 (reverse), MFstable10 r259491, r259492, r260781:

r259582 (reverted):
  Set PACKAGESITE to 'release/0' for the pkg-stage target to pull
  the release set of packages.  (Required to eliminate conflicts.)

r259491:
  Prevent release build errors found during snapshot builds where if
  NOPORTS=1, pkg-stage.sh cannot build the ports-mgmt/pkg port if
  WITH_DVD=1.

r259492:
  Add NOPKG to disable pkg-stage.

r260781:
  Update the pkg-stage target to be more compatible with pkg-1.2:

 - Add a release-dvd.conf pkg(8) configuration file to override
   the default FreeBSD.conf configuration.
 - Remove architecture-specific pkg-stage.conf files, consolidate,
   and move their contents to scripts/pkg-stage.sh.
 - Use 'pkg -vv' to determine the ABI, which is used as the
   cache directory.

  Prior to these changes, it would be possible for pkg-stage to fetch
  conflicting binary packages from multiple repositories.

  A change local to releng/10.0 sets the package fetch URL to
  'release/0'.

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

git-svn-id: svn://svn.freebsd.org/base/releng/10.0@260787 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f