BIND 10 #2859: optimize initial load: API support

[BIND 10 Development]

#2859: optimize initial load: API support
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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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 Subtask of #2830.  Should be done after #2851.

 We are going to optimize the initial setup when the system has
 previously built mapped files.  In this task, we extend
 `ConfigurableClientList::getCachedZoneWriter` so it checks the SOA of
 the actual and cache (in-memory) versions of the zone, and if they
 are identical, simply report so.  We might add a flag so we can force
 loading skipping this optimization.

 Also extend the python wrapper.

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Ticket URL: <http://bind10.isc.org/ticket/2859>
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BIND 10 Development