This got removed accidentally in a recent consolidation of
install-packages. Adding it back so that -d support works again.
Closes-bug: #1287142
Change-Id: If17e613bc9bc0f808517edfa1506858d3b9dce54
All of the yum-based install-packages scripts are doing essentially
the same thing, so let's use one script for all of the elements
that depend on the yum element.
Change-Id: I49e8c9b44e41bcf4cb9fa820e8a9179754694a97