Dragonfly Dally: busy_time fixes based on dfc
During the creation of the dragonfly-dally.C model, QoS features were added. The addition of these features for some reason also removed lines handling last_buf_full behavior. This resulted in busy time always being reported as zero. I've added lines from dragonfly-custom.C regarding this to restore previous behavior. There are still added lines from QoS regarding last_buf_full and busy time in router_packet_send() that are mildly confusing but don't appear to affect final results and are left as is.
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