BIND 10 #2499: basic post-load validation for in-memory data source

[BIND 10 Development]

#2499: basic post-load validation for in-memory data source
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            Reporter:  jinmei        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  assigned
           Component:  data source   |                    Milestone:
            Keywords:                |  Sprint-20130122
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  4             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 With #2435, I guess the easiest way for this task is to introduce
 an internal zone updater class, solely used for in-memory loading
 (so it doesn't even have to be published to other modules in a header
 file).  Then we can use the generic loader for both loading and
 checking.

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Ticket URL: <http://bind10.isc.org/ticket/2499#comment:4>
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