MFC r271876:
  When populating the dvd/packages/ directory, create
  a symlink to All/pkg-*.txz in the Latest/ directory.

  This allows 'pkg bootstrap' to work out-of-box if
  the REPOS_DIR environment is properly set.

Approved by:	re (delphij)
Sponsored by:	The FreeBSD Foundation
MFH (r271624): Upgrade to OpenPAM Ourouparia.

Approved by:	re (gjb)