BIND 10 #2908: Python wrapper for ZoneTable and getZoneTable

[BIND 10 Development]

#2908: Python wrapper for ZoneTable and getZoneTable
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Subtask of #2830, depend on #2906 and #2907.

 Add python wrapper for these new classes and methods.  Make sure
 the zone table iteration uses Python iteration protocol so the
 following won't create an actual list of millions of `ZoneSpec`
 objects.

 {{{#!python
     for zone in datasrc_clients.get_zone_table("sqlite3",
 true).get_zones():
        # do something with zone
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/2908>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development