BIND 10 #1802: identify whether an in-memory zone is NSEC-signed at load time

[BIND 10 Development]

#1802: identify whether an in-memory zone is NSEC-signed at load time
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  data source   |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  in-
         Total Hours:  0             |  memory NSEC
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 there can be several possible ways for that.  I guess one practical
 way is to consider a zone NSEC-signed iff the origin node has an NSEC
 RRset.

 In this task we'd also update the successful wildcard match case of
 find() so it sets the RESULT_NSEC_SIGNED flag of the result context.
 We can use this to test the feature.

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Ticket URL: <http://bind10.isc.org/ticket/1802>
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