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

[BIND 10 Development]

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

 The origin node should never become empty. Who should check if it is OK to
 delete such RRset (such as NS or SOA)?

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Ticket URL: <http://bind10.isc.org/ticket/2752#comment:1>
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