[tor-bugs] #17623 [Tor]: Improve not-a-server behavior of server-only timer callbacks

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#17623: Improve not-a-server behavior of server-only timer callbacks
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     Reporter:  nickm   |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Low     |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor     |    Version:
     Severity:  Minor   |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
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 On #3199, special says:
 >It makes me a little sad that events like rotate_onion_key,
 check_ed_keys, record_bridge_stats will be called once per second on
 clients to handle the unlikely case where the configuration changes and
 they're now relevant. That is consistent with previous behavior, though.
 They have a little more overhead than they used to - at least one time()
 and event_add() each.

 We should clean these up now that timers are refactored.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17623>
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