BIND 10 #2096: Define and implement `RdataIterator` class

[BIND 10 Development]

#2096: Define and implement `RdataIterator` class
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by vorner):

 Is there a reason to use it by callbacks instead of repeatedly calling a
 function? This way the code will end up more confusing I believe.

 If there's a compelling reason, I'd like not to call it Iterator. It looks
 like something similar to foreach.

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Ticket URL: <http://bind10.isc.org/ticket/2096#comment:2>
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