rephist: Introduce a fraction and period for overload onionskin

David Gouletrequested to merge
dgoulet/tor:ticket40560_046_01 into maint-0.4.6

This code was heavily reused from the previous DNS timeout work done in ticket #40491 (closed) that was removed afterall from our code.

Closes #40560 (closed)

Signed-off-by: David Goulet dgoulet@torproject.org

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