[tor-bugs] #6805 [Tor Client]: Restore consensus-governed path bias messages

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#6805: Restore consensus-governed path bias messages
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 Reporter:  mikeperry                     |          Owner:  mikeperry         
     Type:  defect                        |         Status:  new               
 Priority:  major                         |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Client                    |        Version:                    
 Keywords:  MikePerry201209, 023backport  |         Parent:                    
   Points:                                |   Actualpoints:                    
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 The log line for the check against pathbias_get_notice_rate() in
 entry_guard_inc_first_hop_count() should not have been demoted to info
 level. We have a consensus parameter to govern it if it really gets out of
 hand. It can be fully disabled using this parameter, just like the warn
 message can be and is. The warn should not have been demoted either.

 I'm setting this as 'major' based on #6537's priority. I don't believe it
 is rational to merge #6537 and #6538 into 0.2.2.x and 0.2.3.x without also
 informing the user about the possibility a significantly more serious
 active attack.

 I can fix the log message to be less threatening as part of this. I would
 also like to do this commit on top of the #6647 backport.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6805>
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