BIND 10 #2907: add ConfigurableClientList::getZoneTable class

[BIND 10 Development]

#2907: add ConfigurableClientList::getZoneTable class
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                   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.

 This is a simple addition to the `ConfigurableClientList` class:

 {{{#!cpp
 class ConfigurableClientList {
 public:
     shared_ptr<const ZoneTable> getZoneTable(const std::string&
 datasrc_name,
                                              bool use_cache);
 };
 }}}

 It creates a `ZoneTable` object for the specified data source and
 return it.  If `use_cache` is true, create a zone table for in-memory
 cache.

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Ticket URL: <http://bind10.isc.org/ticket/2907>
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BIND 10 Development