[Varnish] #1316: req.grace = 0s does not disable grace

[Varnish]

#1316: req.grace = 0s does not disable grace
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 Reporter:  daghf   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  trunk
 Severity:  normal  |   Keywords:
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 Varnish still serves stale objects with req.grace = 0s set in vcl_recv.

 Related: #1315

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1316>
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