Remove duplicate distribution repository
    
    New physical machines are installed with a "openSUSE-Leap-<version>-<count>"
    repository pointing to distribution/leap/<version>/repo/oss/.
    We already manage this path with a repository named "repo-oss" in
    pillar.osfullname.Leap - ensure the unmanaged duplicate gets removed.
    
    Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>