[tor-bugs] #16274 [Tor]: Set the max open file value to the current limit if setrlimit() fails

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#16274: Set the max open file value to the current limit if setrlimit() fails
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 Reporter:  dgoulet   |          Owner:
     Type:  defect    |         Status:  new
 Priority:  critical  |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor       |        Version:
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
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 In `set_max_file_descriptors()`, if `setrlimit()` fails, we log warn and
 bail out leaving the `max_out` pointer unset.

 It should be set to the current value returned by `getrlimit()` before we
 try to change it with `setrlimit()`.

 Flagging this as critical because right now on commit
 e48f8e5e87603812a6b1844a5fa27bbc44a3543e, if the
 ed25519_master_id_public_key can't be opened, tor shuts down.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16274>
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