BIND 10 #2333: add tests about type NSEC query at a parent zone cut

[BIND 10 Development]

#2333: add tests about type NSEC query at a parent zone cut
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       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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 See this thread
 http://www.ietf.org/mail-archive/web/dnsext/current/msg12756.html

 The BIND 10 implementation (either from in-memory or database) always
 returns the referral, just like other ordinary types.

 It's still not clear (to me) what the server should do, but the
 sense seems to be "it's implementation dependent".  Assuming that's
 the consensus, this ticket is to add some unit (and maybe system)
 tests to explicitly confirm the behavior, and describe why we behave
 that way somewhere.

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Ticket URL: <http://bind10.isc.org/ticket/2333>
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BIND 10 Development