BIND 10 #1333: Add python wrappers of the updates to ZoneUpdater and ZoneJournalReader

[BIND 10 Development]

#1333: Add python wrappers of the updates to ZoneUpdater and ZoneJournalReader
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20111122
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  5
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:         |
                  Internal?:  0      |
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Comment (by jinmei):

 trac1333r is (basically) ready for review. (r = reader)

 It depends on #1332, which has some ongoing discussion, but I decided
 to complete it in the hope that we might be able to complete IXFR-out
 before the release.  At least once the API design of #1332 is fixed
 this branch can be reviewed.

 The first two commits are the dependency merge and should be ignored.

 I believe the implementation itself is quite straightforward.

 Proposed Changelog entry:
 {{{
 320.?   [func]          jinmei
         Python isc.datasrc: added interfaces for difference management:
         DataSourceClient.get_updater() now has the 'journaling' parameter
         to enable storing diffs to the data source, and a new class
         ZoneJournalReader was introduced to retrieve them, which can be
         created by the new DataSourceClient.get_journal_reader() method.
         (Trac #1333, git TBD)
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/1333#comment:14>
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