Time syncing can break Tor bootstrap when using several bridges with different certificate lifespans

See #5394-note_16 for the problem this ticket currently tracks: the initial analysis was incorrect.

Feature Branch: bugfix/5394-time_syncing_in_bridge_mode+force-all-tests

Original created by @tails on 5394 (Redmine)

Edited Nov 22, 2019 by intrigeri

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