Simplify dvd package population with pkg-1.3.

Submitted by:	bdrewery
MFC after:	3 days
X-MFC-With:	r271480, r271483
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271491 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f