[tor-bugs] #30125 [Obfuscation/Snowflake]: Port server's log sanitization to client, broker, and proxy-go

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#30125: Port server's log sanitization to client, broker, and proxy-go
---------------------------------------+--------------------
     Reporter:  dcf                    |      Owner:  (none)
         Type:  enhancement            |     Status:  new
     Priority:  Medium                 |  Milestone:
    Component:  Obfuscation/Snowflake  |    Version:
     Severity:  Normal                 |   Keywords:
Actual Points:                         |  Parent ID:
       Points:                         |   Reviewer:
      Sponsor:                         |
---------------------------------------+--------------------
 #21304 added a log sanitizer to the server (bridge) code that searches for
 IP addresses in logs and elides them. We noted in comment:17:ticket:21304
 that the other components--client, broker, and proxy-go--can benefit from
 the same log sanitization.

 comment:18:ticket:21304 suggests a way to do it: move the `logScrubber`
 code into a new top-level subdirectory and `safelog` package, and have the
 other programs `import git.torproject.org/pluggable-
 transports/snowflake.git/safelog`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30125>
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