BIND 10 #1582: auth::Query NSEC3 support: No Data, DS case

[BIND 10 Development]

#1582: auth::Query NSEC3 support: No Data, DS case
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  b10-auth      |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  NSEC3
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 This task implements RFC5155 7.2.3 and updates ZoneFinder::NXRRSET case of
 Query::process():
 - call findNSEC3(recursive = true) for the returned rrset.getName()
   (or qname).  It will return the NSEC3 of the DS name (if exist)
   or the NSEC3 of the provable closest enclosure.
 - Check the # of label of the returned nsec.getName().
   If it's smaller than that of qname,  It's a provable closest
   enclosure (different from the DS name).  Construct the next closer
   name and call findNSEC3(recursive = false).  It will return the
   NSEC3 covering the next closer.
 - add the returned NSEC3s to the authority section

 Depends on #1431 (and probably on #1570)

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Ticket URL: <https://bind10.isc.org/ticket/1582>
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BIND 10 Development