BIND 10 #294: friendlier error for incompatible/old configuration database

[BIND 10 Development]

#294: friendlier error for incompatible/old configuration database
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      Reporter:  jreed          |        Owner:  each                       
          Type:  defect         |       Status:  reviewing                  
      Priority:  major          |    Milestone:  06. 4th Incremental Release
     Component:  configuration  |   Resolution:                             
      Keywords:                 |    Sensitive:  0                          
Estimatedhours:  0.0            |        Hours:  0                          
      Billable:  1              |   Totalhours:  0.5                        
      Internal:  0              |  
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Changes (by jelte):

  * owner:  jelte => each


Comment:

 ok, applied your suggestions in r2692, please verify

 i also made the catch-all only catch json's ValueError (which is raised on
 a parse error), for which it was intended (i thought i had removed that
 one already; it catched our own exceptions there)

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Ticket URL: <http://bind10.isc.org/ticket/294#comment:13>
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