[Varnish] #750: old probes don't get discarded when new config is activated

[Varnish]

#750: old probes don't get discarded when new config is activated
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 Reporter:  perbu   |       Owner:       
     Type:  defect  |      Status:  new  
 Priority:  normal  |   Milestone:       
Component:  build   |     Version:  2.1.2
 Severity:  minor   |    Keywords:       
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 If you define a probe and then load a new VCL with the same health check
 the old one will hang around and clutter "debug.health".

 vcl.discard works around the issue.

 I'm not sure if the probes are actually _run_. That would be a real bug.

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Ticket URL: <http://www.varnish-cache.org/ticket/750>
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