1c6999d conf: RNG: Always fill in default random source path for default backend

Authored and Committed by Peter Krempa 9 years ago
    conf: RNG: Always fill in default random source path for default backend
    
    Libvirt documents that the default entropy source for the 'random'
    backend of a RNG device is /dev/random. Instead of storing and
    propagating NULL across our code and checking it in multiple places fill
    the default in the post parse callback and use that in the other places.
    
        
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