[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    |       Type:  defect
   Status:  new    |   Priority:  normal
Milestone:         |  Component:  build
  Version:  4.0.3  |   Severity:  normal
 Keywords:         |
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 Open a varnishtop or varnishhist in a terminal. Then close the terminal,
 and the program just launched keeps running.
 Often the program will spin on 100% CPU and need a SIGKILL to terminate.

 We expect the program to terminate.

 Verified on RHEL6 and Arch current, so it's not a distribution-specific
 issue.

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