BIND 10 #2435: implement datasrc version of RRsetCollection

[BIND 10 Development]

#2435: implement datasrc version of RRsetCollection
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:  data   |           Sub-Project:  DNS
  source                             |  Estimated Difficulty:  0
                   Keywords:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Description changed by jinmei:

Old description:

> Subtask of #2368, and part of post-load checker.  Depend on #2432.
>
> See
> http://bind10.isc.org/wiki/ZoneLoadingAPIDesign#a2.2ClassesFunctionsforValidating
> for the basic idea.

New description:

 Subtask of #2368, and part of post-load checker.  Depend on #2432.

 See
 http://bind10.isc.org/wiki/ZoneLoadingAPIDesign#a2.2ClassesFunctionsforValidating
 for the basic idea.

 As noted in wiki, `foreach()` cannot be implemented.  for now it should be
 okay to throw `NotImplemented`

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Ticket URL: <http://bind10.isc.org/ticket/2435#comment:1>
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