Load koji config without module name
    
    We can't unconditionally access self.module_name, as it might lead to
    infinite recursion.
    
    Replication steps:
    
        fedpkg clone fedpkg
        cd fedpkg
        git remote remove fedpkg
        fedpkg --dist master verrel
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>