BIND 10 #2539: implement InMemoryClient iterator getSOA()

[BIND 10 Development]

#2539: implement InMemoryClient iterator getSOA()
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            Reporter:  vorner        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  reviewing
           Component:  data source   |                    Milestone:
            Keywords:                |  Sprint-20131015
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  3             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 I'm wrong. Upon a re-reading of the `ZoneIterator` doc, it seems that
 caching the SOA `RRset` before zone iteration is actually required. So
 your change is not only an optimization, but actually necessary.

 I'll review the commit and get back to you soon.

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Ticket URL: <http://bind10.isc.org/ticket/2539#comment:8>
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