BIND 10 #2212: support "load zone" command in the configurator thread

[BIND 10 Development]

#2212: support "load zone" command in the configurator thread
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20121023
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  b10-auth                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  5
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  background zone loading            |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 I've pushed some initial work for this task at branch trac2212.

 It added the "LODAZONE" command for the loader thread, and ported
 the current command handler code in a mostly straightforward way.
 corresponding tests in command_unittest were also ported.

 When #2209 is done, we'll update the `doLoadZone()` internal
 as described in this ticket based on (snapshot of) #2209, and
 adjust tests.

 I'm going to release this ticket now.  Please feel free to take it
 over if #2209 is completed soon.

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Ticket URL: <http://bind10.isc.org/ticket/2212#comment:5>
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