Partial MFC r316676 and the required r313045
MFC r316676:
Use estimated RTT for receive buffer auto resizing instead of timestamps.
This is a partial MFC as stable/10 doesn't include the TCP stack
modularisation.
MFC r313045:
Add an mbuf to ipinfo_t translator to finish cleanup of mbuf passing to TCP
probes. This is a partial MFC (missing debug__output & debug__drop changes)
due to the massive amount of additional dtrace changes that would be
required for a full MFC.
Relnotes: Yes
Sponsored by: Multiplay
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