[Varnish] #171: Support logging ip and port of varnishd instance

[Varnish]

#171: Support logging ip and port of varnishd instance
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 Reporter:  Caleb        |       Owner:  phk  
     Type:  enhancement  |      Status:  new  
 Priority:  normal       |   Milestone:       
Component:  varnishd     |     Version:  trunk
 Severity:  normal       |    Keywords:       
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 Varnish should be able to log the ip and port that the varnishd instance
 is listening on. This will help in supporting the W3C Extended log format
 and it's s-ip and s-port fields.

 PHK said that these need to go into the SessionOpen log record.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/171>
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