[Varnish] #739: varnishlog sometimes reports backend logs as client logs

[Varnish]

#739: varnishlog sometimes reports backend logs as client logs
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 Reporter:  thoran      |        Owner:  martin
     Type:  defect      |       Status:  closed
 Priority:  normal      |    Milestone:        
Component:  varnishlog  |      Version:  2.1.2 
 Severity:  major       |   Resolution:  fixed 
 Keywords:              |  
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Comment(by tfheen):

 (In [5341]) Merge r5160: Flush log on backend close

 Add explicit log flushing when backend connections close to keep log
 chronology. This is to avoid log lines for the same (reused) FD coming
 before the closing connection when load is high.

 Fixes #739

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Ticket URL: </ticket/739#comment:5>
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