BIND 10 #380: Remove duplicate code from _setup_session and config_handler

[BIND 10 Development]

#380: Remove duplicate code from _setup_session and config_handler
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      Reporter:  zzchen_pku         |        Owner:  vorner   
          Type:  enhancement        |       Status:  reviewing
      Priority:  major              |    Milestone:           
     Component:  secondary manager  |   Resolution:           
      Keywords:                     |    Sensitive:  0        
Estimatedhours:  0.0                |        Hours:  0        
      Billable:  1                  |   Totalhours:  0        
      Internal:  0                  |  
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Changes (by zzchen_pku):

  * owner:  zzchen_pku => vorner
  * status:  accepted => reviewing


Comment:

 Michal, can you help to review this, as you are familiar with it.
 Since it is trivial, I don't think we need a separate changelog entry for
 this change.
 Please find the new change in revision r3285, thanks.

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Ticket URL: <https://bind10.isc.org/ticket/380#comment:2>
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