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

MFC r259426, r259427:

r259426:
Add a pkg(8) repository configuration file for cdrom-based package
installation.

As part of the 'pkg-stage' target, copy the configuration file
to the 'packages/repos/' directory on the DVD filesystem.

r259427:
Export 'REPOS_DIR' when the selected source medium for package
installation is cdrom. This enables bsdconfig(8) to make use
of the on-disc pkg(8) repository configuration, which fixes
package selection and installation from the dvd installer.

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

MFC r256430, r259400:

r256430:
Reduce disc1.iso image size by installing the userland with
the WITHOUT_PROFILE=1 option set, trimming 56MB from the image.

r259400:
Reduce disc1.iso size by 74MB by removing lib32 libraries, sendmail,
and atf.

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

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

MFC r259426, r259427:

r259426:
Add a pkg(8) repository configuration file for cdrom-based package
installation.

As part of the 'pkg-stage' target, copy the configuration file
to the 'packages/repos/' directory on the DVD filesystem.

r259427:
Export 'REPOS_DIR' when the selected source medium for package
installation is cdrom. This enables bsdconfig(8) to make use
of the on-disc pkg(8) repository configuration, which fixes
package selection and installation from the dvd installer.

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

MFC r256430, r259400:

r256430:
Reduce disc1.iso image size by installing the userland with
the WITHOUT_PROFILE=1 option set, trimming 56MB from the image.

r259400:
Reduce disc1.iso size by 74MB by removing lib32 libraries, sendmail,
and atf.

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