BIND 10 #2752: define and implement ZoneDataUpdater::delete()

[BIND 10 Development]

#2752: define and implement ZoneDataUpdater::delete()
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            Reporter:  jinmei        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  assigned
           Component:  data source   |                    Milestone:
            Keywords:                |  Sprint-20130917
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  6             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 Note to self: After #2750 is merged, add a test in `trac2752` that root
 node (.) is not removed during cleanup after a down node is `remove()`d.

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Ticket URL: <http://bind10.isc.org/ticket/2752#comment:11>
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