See a path that stops carrying larger datagrams, and go back to the first size

A link that found the path carries 1,452 bytes kept sending them when a
route changed and larger packets were dropped with nothing said (a
black hole): it lost them one after another and stood still (test-link:
8 of 3,000 records in ten minutes). Now, as RFC 8899 §4.3 has it, it goes
back to 1,200 bytes when three larger packets in a row are lost while an
acknowledgment covers only smaller ones, or when two probes in a row go
unanswered, and tries the larger size again a second on (three tries,
then ten minutes). The case completes in 1.2 s of virtual time; the M6
simulator's results are the same to the byte in eight paths of loss,
reordering and a bottleneck.

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