[Varnish] #722: Director cleanup issue on vcl.discard

[Varnish]

#722: Director cleanup issue on vcl.discard
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 Reporter:  phk       |        Owner:  phk   
     Type:  defect    |       Status:  closed
 Priority:  normal    |    Milestone:        
Component:  varnishd  |      Version:  trunk 
 Severity:  normal    |   Resolution:  fixed 
 Keywords:            |  
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Comment(by tfheen):

 (In [5040]) Merge r4967: Fix a problem in director teardown at vcl.discard
 time

 We didn't create/destroy directors and backends in a consistent order,
 and in some case we even destroyed directors more than once.

 Always destroy in opposite order of creation (which follows VCL
 source order).

 Turn the bottom element of the array into (only) an indication
 of which backend/director is the default.

 Fixes:  #722

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Ticket URL: </ticket/722#comment:2>
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