BIND 10 #2271: complete in-memory zone iterator

[BIND 10 Development]

#2271: complete in-memory zone iterator
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  data source   |  Tasks
           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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 From code inspection there seem to be some open issues for the
 in-memory zone iterator (I'm referring to the new version).

 - It doesn't cover NSEC3 RRsets.
 - It doesn't seem to cover RRSIGs in the "separate RRs" mode.
 - It doesn't implement getSOA().

 We'll need these, e.g., if we want to allow xfrout to use the
 in-memory iterator for AXFR.

 Note: if we complete this ticket we should be able to close #1666.

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Ticket URL: <http://bind10.isc.org/ticket/2271>
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