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:  UnAssigned
          Type:  defect         |       Status:  reviewing 
      Priority:  major          |    Milestone:            
     Component:  configuration  |   Resolution:            
      Keywords:                 |    Sensitive:  0         
Estimatedhours:  0.0            |        Hours:  0         
      Billable:  1              |   Totalhours:  0.25      
      Internal:  0              |  
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Changes (by jelte):

  * owner:  jelte => UnAssigned
  * status:  new => reviewing


Comment:

 Error message should be better now (also includes file path btw).

 Updated the code around that read as well.

 I've also bumped the version, and fixed the other occurrences that had
 hardcoded version number here. In order to do that right, i had to move
 the constant out of cfgmgr.py (which isn't a 'general library' module, and
 i put it under another name in config_data.py (which is).

 Iff it can read the old (version 1) file, cfgmgr automatically 'updates'
 it to 2.

 changes in branches/trac294, relevant revs are r2609 and r2610

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Ticket URL: <http://bind10.isc.org/ticket/294#comment:2>
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