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:         |                 Owner:  jinmei
  jinmei                             |                Status:  reviewing
                       Type:         |             Milestone:
  defect                             |  Sprint-20120612
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:  data   |           Sub-Project:  DNS
  source                             |  Estimated Difficulty:  6
                   Keywords:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by vorner):

 * owner:  vorner => jinmei


Comment:

 Hello

 The code looks clean, but I'm not sure it is doing exactly what is needed.
 It surely does return the DS record that is sitting on the delegation
 point. But what if the query is for a name below the delegation point?
 That one is not authoritative any more and should be delegated. Or, I
 think so, I didn't read the specs regarding this, it just seems logical.

 What I mean is, if I send a query for `example.org./DS` to the root
 server, I should be delegated to the `org.` zone, not get an `NXDOMAIN`,
 which is what I think would happen. Also, we should have a test for just
 that.

 Thank you

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Ticket URL: <http://bind10.isc.org/ticket/1912#comment:4>
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