BIND 10 #3018: extend ConfigurableClientList::getStatus() to indicate if zone table segment is dirty

[BIND 10 Development]

#3018: extend ConfigurableClientList::getStatus() to indicate if zone table
segment is dirty
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:  data   |           Sub-Project:  DNS
  source                             |  Estimated Difficulty:  0
               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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 It's continuation of #3017 and depends on it (actually mostly
 independent from details of #3017, but probably easier to test with
 a complete implementation of #3017).

 Specifically we extend `DataSourceStatus` to have `isSegmentDirty()`
 method (returning bool).  `getStatus()` ensures that `isSegmentDirty()`
 will return true iff the zone table segment exists and its `isDirty()`
 returns true.

 Also update the Python wrapper accordingly.

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Ticket URL: <http://bind10.isc.org/ticket/3018>
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