BIND 10 #1068: support writability in the new data source API

[BIND 10 Development]

#1068: support writability in the new data source API
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20110830
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  7.0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 The second part of this task is ready for review.  It's on branch
 trac1068review2.

 A couple of notes:
 - I wanted to make one other set of changes: making DatabaseClientTest
   polymorphic and share the tests for sqlite3, too.  I have code for
   that, but it would probably make the entire diff too large, so I
   decided not to include it this time.  That will be the next (and
   final) round of the review process.
 - the change to rrsig_46 is completely unrelated to the task.  I
   happened to notice we can/should make this change when I tried to
   use it, and since it was very small I piggy-backed it on this
   branch.

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Ticket URL: <http://bind10.isc.org/ticket/1068#comment:12>
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