BIND 10 #2282: implement specialized additional handling in in-memory data source

[BIND 10 Development]

#2282: implement specialized additional handling in in-memory data source
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 We should re-implement specialized additional record handling for the
 new in-memory data source implementation.

 Specifically, we should implement specialized getAdditionalImpl()
 method for the `InMemoryZoneFinder::Context` class:

 - it should remember the `RdataSet` returned as the answer
 - use `RdataReader` to iterate over names in the rdataset that
   requires additional section processing
 - lookup in the tree for the corresponding `LabelSequence` and get the
   requested type RRsets

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Ticket URL: <http://bind10.isc.org/ticket/2282>
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