[Varnish] #1407: Varnishd loses the ability to write to shared memory if you try to start it twice

[Varnish]

#1407: Varnishd loses the ability to write to shared memory if you try to start it
twice
-----------------------------+----------------------
 Reporter:  brandonwamboldt  |       Type:  defect
   Status:  new              |   Priority:  normal
Milestone:                   |  Component:  varnishd
  Version:  3.0.3            |   Severity:  normal
 Keywords:                   |
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 If you start Varnish, and then try to start it again using the varnishd
 command directly, it will take over the shared memory file from the
 running varnishd process, then exit as it fails to bind ports. This leaves
 the original process unable to write to shared memory.

 It does throw a warning, "WARNING: Taking over SHMFILE marked as owned by
 running process (pid=29585)", but I feel like this could be handled
 better.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1407>
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