[Varnish] #1457: vcl.show should mention which include some piece of source is from

[Varnish]

#1457: vcl.show should mention which include some piece of source is from
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 Reporter:  slink   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  unknown
 Severity:  normal  |   Keywords:
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 from VDD13Q4 recap VDD13Q2

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1457>
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