[Varnish] #1530: re-check expire ims obj

[Varnish]

#1530: re-check expire ims obj
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 Reporter:  slink   |      Owner:  phk
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  trunk
 Severity:  normal  |   Keywords:
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 as discussed at [wiki:VDD14Q2]: please re-visit the code which expires
 candidate objects for refresh:
 * any successful fetch should expire the "ims obj"
 * which implies that any unsuccessful fetch should not

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1530>
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