Revert productName repo name change (#1128474)
    
    The products want the ability to make Product specific netinst isos.
    Personally, I think this is the wrong approach, but in order to allow them the
    flexibility I'll revert my .buildstamp Product patch.
    
    This means that when making a compose the composer has to be sure they include
    a package installing a repo to /etc/yum.repos.d/ that has an id matching the
    lower-case version of the product name (eg. fedora-server or
    fedora-workstation). Without this the closest mirror option will not work
    because anaconda doesn't know the name of the repo to use.