common-ostree: Explicitly list lvm2
    
    Surprisingly in comps, it's just part of the anaconda group,
    and so it ends up on workstation systems indirectly because
    anaconda is part of the livecd.
    
    For Fedora Atomic Host, we list it explicitly.
    
    It turns out that when we dropped `docker/atomic`, nothing else
    was pulling in `lvm2`.