BIND 10 #1067: support zone iterator in the new data source API

[BIND 10 Development]

#1067: support zone iterator in the new data source API
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20110816
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  4.0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by vorner):

 I updated the interface a little, so it is more similar to the one in
 #1062. I also merged with master (where #1061 was merged before) to
 incorporate latest changes from there. So current diff can be requested by
 `git diff master...`.

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Ticket URL: <http://bind10.isc.org/ticket/1067#comment:5>
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