BIND 10 #1793: update b10-auth command handler to reload in-memory/sqlite3

[BIND 10 Development]

#1793: update b10-auth command handler to reload in-memory/sqlite3
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  assigned
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120417
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  b10-auth                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:  xfr    |
  for in-memory                      |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 #1792 is now in the review queue.  Maybe it's better to hold off until
 we at least confirm it doesn't have a critical issue, but if we want
 to maximize the concurrency we can start the development on top of the
 latest trac1792 branch.

 I found it quite easy to instantiate the necessary data source client.
 But in #1792 I didn't add any framework to share the configuration for
 the underlying data source, so in this ticket we should also complete
 that part, i.e., somehow managing the information whether an inmemory
 zone is based on the SQLite3 data source, and if so, which
 configuration should be used to instantiate the corresponding client.

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Ticket URL: <http://bind10.isc.org/ticket/1793#comment:5>
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