BIND 10 #2433: implement validateZone, base part

[BIND 10 Development]

#2433: implement validateZone, base part
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  libdns++      |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Subtask of #2368, and part of post-load checker.  Depend on #2432.

 See
 http://bind10.isc.org/wiki/ZoneLoadingAPIDesign#a2.2ClassesFunctionsforValidating
 for the basic idea.  Maybe this should be a class like others.
 Consider that option.

 Regarding the checks, see BIND 9's lib/dns/zone.c:zone_postload().
 Those include:
 - existence of atop NS an SOA
 - number of SOAs

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Ticket URL: <http://bind10.isc.org/ticket/2433>
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BIND 10 Development