Update the NetVC route graph

[Chao Xu]

Hi buddy,

I have update the diagram how the netvc route in the Net Sub-System.

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 CH02-IOCoreNet-002.png
<https://drive.google.com/file/d/0B6FSuL4tHtSHRmg4OHRBYVMzV0U/view?usp=drive_web>
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Oknet