BIND 10 #1912: handle type DS query in database-based data sources correctly

[BIND 10 Development]

#1912: handle type DS query in database-based data sources correctly
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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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 Not confirmed, but from code inspection I suspect databsrc/database.cc
 doesn't handle type DS query correctly; it would consider it a
 delegation (or maybe treat it as an error due to the "NS + other"
 check in getRRsets()).

 This should be corrected.

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Ticket URL: <http://bind10.isc.org/ticket/1912>
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BIND 10 Development