BIND 10 #1583: auth::Query NSEC3 support: Wildcard no data case

[BIND 10 Development]

#1583: auth::Query NSEC3 support: Wildcard no data 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:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 This task implements RFC5155 7.2.5 and updates
 ZoneFinder::WILDCARD_NXRRSET case of Query::process():
 - call findNSEC3(recursive = false) for rrset.getName() of the
   returned rrset (it's for the matching wildcard).  It will return
   the NSEC3 that matches the wildcard.  If the result is not exact
   matching we'd probably return SERVFAIL.
 - call findNSEC3(recursive = true) for qname.  It will return the
   NSEC3 of the provable closest enclosure.  Its label length should
   be shorter than that of qname; otherwise we'd probably return
   SERVFAIL.
 - construct the next closer name based on the closest enclosure and
   qname, and call findNSEC3(recursive = false) for it.  It will
   return the NSEC3 covering the next closer.  This shouldn't be an
   exact match; otherwise we'd probably return SERVFAIL.
 - add the returned NSEC3s to the authority section

 Depends on #1431.

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Ticket URL: <https://bind10.isc.org/ticket/1583>
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