wait_until_tor_is_working helper is fragile

Originally created by @anonym on #10497 (Redmine)

We did what we could, basically, with #9516 (closed). The real fix is something like #10238 (closed).

f8e5fb99 and 1c48ca26 tagged these tests as fragile.

Feature Branch: test/10497-tor-bootstrap-is-fragile

Edited May 15, 2020 by anonym

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