We have a new package-installs file format. Migrating existing
package-installs files to the new format.
Change-Id: I57d4a007efee9624e60c41357cefa627d8c7373f
Updates additional elements in diskimage-builder to use the declarative
package install support provided by the package-installs element.
package-installs does not yet support the pkg-map functionality, so
elements using pkg-map are not migrated. That support will come in the
near future.
Change-Id: I3d36adad317ba44326eabd95243d45807e2a8a16