Switch from "quarterly" to "release" pkgs on DVD

Approved by:	re (implicit)
Sponsored by:	OpenSats Initiative

release/pkg_repos/release-dvd.conf

@@ -1,5 +1,5 @@
 release: {
-  url: "pkg+http://pkg.FreeBSD.org/${ABI}/quarterly",
+  url: "pkg+http://pkg.FreeBSD.org/${ABI}/release_1",
   mirror_type: "srv",
   signature_type: "fingerprints",
   fingerprints: "/usr/share/keys/pkg",