BIND 10 #1373: DataSourceClient::getIterator should differentiate no-such-zone case

[BIND 10 Development]

#1373: DataSourceClient::getIterator should differentiate no-such-zone case
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           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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 Currently it throws a generic DataSourceError exception (and the
 python version raises isc.datasrc.Error).  Since this can be thrown
 for other reasons than the case where the specified zone doesn't
 exisit, xfrout cannot decide whether it should return NOTAUTH
 or other Rcode.

 The bottom line is we should differentiate this case with other errors.
 Possibilities include a separate error code with NULL/None (like find())
 and a dedicated exception.  I personally prefer the former especially
 for C++, but that's debatable.

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Ticket URL: <http://bind10.isc.org/ticket/1373>
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