Increase the number of Tor circuit retries in the test suite

The main rationales for this are OFTC’s blocking of Tor and communication problems with the keyservers.

anonym wrote:

OFTC blocking is still a problem. We could try bumping the retries from 5 to 10. Thoughts?

I think raising the default to 10 or more would be fine. Any users that may want to run the test suite can set this however they’d like.

Feature Branch: kytv:test/10375-bump-Tor-retry-limit

Parent Task: #10288

Original created by @kytv on 10375 (Redmine)

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