[Varnish] #1794: varnish*-tools do not die when terminal disconnects

[Varnish]

#1794: varnish*-tools do not die when terminal disconnects
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 Reporter:  kwy     |       Owner:
     Type:  defect  |      Status:  new
 Priority:  normal  |   Milestone:
Component:  build   |     Version:  4.0.3
 Severity:  normal  |  Resolution:
 Keywords:          |
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Comment (by fgsch):

 Attached patch should fix this and refuse -D without -w.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1794#comment:4>
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