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to give way for the pluggable congestion control framework. It is the task of the congestion control algorithm to set the congestion window and amount of inflight data without external interference. In 'struct tcpcb' the variables previously used by the inflight limiter are renamed to spares to keep the ABI intact and to have some more space for future extensions. In 'struct tcp_info' the variable 'tcpi_snd_bwnd' is not removed to preserve the ABI. It is always set to 0. In siftr.c in 'struct pkt_node' the variable 'snd_bwnd' is not removed to preserve the ABI. It is always set to 0. These unused variable in the various structures may be reused in the future or garbage collected before the next release or at some other point when an ABI change happens anyway for other reasons. No MFC is planned. The inflight bandwidth limiter stays disabled by default in the other branches but remains available.
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