a01d935 storage: Add NONE protocol type for network disks

Authored and Committed by Peter Krempa 9 years ago
    storage: Add NONE protocol type for network disks
    
    Currently the protocol type with index 0 was NBD which made it hard to
    distinguish whether the protocol type was actually assigned. Add a new
    protocol type with index 0 to distinguish it explicitly.
    
        
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