Busybox should be installed and managed from the ramdisk element,
since that is common to all elements that need busybox. In
addition, we do not want busybox installed when building Dracut
ramdisks, so it can't be in the deploy-* elements.
Change-Id: I2656d20b466138f7f6dfcf558ba90c6909151d3c
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
