BIND 10 #1571: DS query handling in in-memory data source

[BIND 10 Development]

#1571: DS query handling in in-memory data source
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    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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 DS query requires special handling (see also #1570).  We need to
 update `InMemoryZoneFinder::find()` so that if the query type is
 DS and the qname is not the zone origin it will handle the case as if
 it were above the zone cut (i.e., as authoritative lookup).

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Ticket URL: <https://bind10.isc.org/ticket/1571>
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BIND 10 Development