BIND 10 #1375: implement "ZoneTableUpdater"

[BIND 10 Development]

#1375: implement "ZoneTableUpdater"
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       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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 To completely replace the old data source API, we need some more
 interfaces to manage "zone tables".  One of them is the "ZoneTableUpdater"
 (tentaively named) class.  It would be created via DataSourceClient,
 and provides an interface to add or delete a zone to/from the data
 source.

 (maybe we should divide this task into a few sub tasks).

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Ticket URL: <http://bind10.isc.org/ticket/1375>
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