[Varnish] #1609: Reset MGT.child_panic after a panic.clear

[Varnish]

#1609: Reset MGT.child_panic after a panic.clear
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 Reporter:  coredump  |       Type:  enhancement
   Status:  new       |   Priority:  normal
Milestone:            |  Component:  build
  Version:  4.0.2     |   Severity:  normal
 Keywords:            |
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 When you use `panic.clear` on `varnishadmin` the MGT counter on
 `varnishstats` doesn't reset back to zero. If you are doing a test with a
 tool like the nagios scripts that check that value for critical and
 warning values you will end on that status forever after a panic.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1609>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator