Before this commit, a simulator packet that crosses pnodes was being
decapsulated if it was determinted that the packet was destined to some sim node on the same pnode. This was done at the entry point of the packet from the live network. However, in the case of disconnected partitions, the packet may have to exit the pnode one or more times before reaching the final destination. In this case, the decapsulation of it early is a waste. This commit remedies that by performing the decapsulation in the port classifier of a node just before the packet is given to a traffic agent that will consume the packet.
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