BIND 10 #2433: implement validateZone, base part

[BIND 10 Development]

#2433: implement validateZone, base part
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  jinmei
            Priority:  medium        |                       Status:
           Component:  libdns++      |  accepted
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130108
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 Yet another thing: in `RRsetCollectionBase`, protected things should
 generally be documented sufficiently detailed so that derived class
 implementor can implement their version from the documentation.

 Also for `iterator`.  And, btw, per naming convention it should be
 named something like `Iterator`.

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Ticket URL: <http://bind10.isc.org/ticket/2433#comment:5>
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