Randomize the introduction point accepted INTRODUCE2 count
This is to address b) in the parent ticket #15714 (moved).
It shouldn't be a fixed value else an attacker can count the number of intros required to rotate the intro point to gauge the popularity of a hidden service.
See comment 1 and 2 from the parent ticket on this subject. https://trac.torproject.org/projects/tor/ticket/15714#comment:1 https://trac.torproject.org/projects/tor/ticket/15714#comment:2
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