[Varnish] #690: Allow for a negative grace period for internal crawler

[Varnish]

#690: Allow for a negative grace period for internal crawler
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 Reporter:  mikeytown2  |        Type:  enhancement
   Status:  new         |    Priority:  normal     
Milestone:              |   Component:  build      
  Version:  2.0         |    Severity:  normal     
 Keywords:  grace       |  
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Comment(by tfheen):

 You don't need to set a negative grace period for that to happen, you can
 just expire the object by setting the TTL to zero and setting req.grace to
 0 for the crawler.

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Ticket URL: <http://www.varnish-cache.org/ticket/690#comment:3>
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