BIND 10 #1288: Update XFROUT to use new interface

[BIND 10 Development]

#1288: Update XFROUT to use new interface
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20111122
                  Component:         |            Resolution:
  xfrout                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  5
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 trac1288 is ready for review.

 The branch resulted in a bit bigger than I expected, partly because
 I didn't realize I would need to updte notify_out, too.  Here are some
 hints for the reviewer that hopefully mitigates the review load:

 - changes to xfrout and notify_out are completely independent.  So, if
   the entire branch is deemed to be too big, we can separate these
   into separate (conceptual or real) sub tasks and review them
   separately.
 - commit 7a59033 is also independent from others, but is necessary for
   the change to work in an installed environment.
 - main changes for the topic of this task are marked in the commit
   logs as "switch to new API'.  Others are basically related cleanups
   or small bug fixes piggy-backed on this ticket.
 - commit ca42fb6 is a bug fix, and it's not directly specific to this
   branch (this problem should exist in the current implementation,
   too), but using a generic datasource API may increase the
   possibility of getting exceptions unexpectedly, which will increase
   the possibility of this bug.  So I decided to fix it in this branch.
   Again, if the branch seems to be too big, we can defer this part to
   a separate branch or task.
 - commit f01fb1d is an improvement on top of the changes.  I believe
   this is useful and thought it was a good opportunity to make it
   happen, but once again this can be deferred.

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Ticket URL: <http://bind10.isc.org/ticket/1288#comment:9>
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