BIND 10 #2906: define and implement (generic) ZoneTable class

[BIND 10 Development]

#2906: define and implement (generic) ZoneTable class
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  jinmei
            Priority:  medium        |                       Status:
           Component:  data source   |  accepted
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130514
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  5             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 trac2906 is ready for review.

 On thinking about details, I chose to make it slightly different
 from what was originally proposed in the ticket (while the overall
 point should be preserved):

 - I named it `ZoneTableAccessor`, not just "table".  Just like we call
   `DataSourceClient` or `DatabaseAccessor` so rather than `DataSource`
   or `Database`.
 - I decided not to use std:: compatible iterator.  I explained the
   rationale in the documentation.

 Other than these the implementation should be pretty straightforward
 and easy to review.

 I don't think we need a changelog entry for this extension per se.
 (#2907 may require an entry though).

-- 
Ticket URL: <http://bind10.isc.org/ticket/2906#comment:5>
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