BIND 10 #2751: add "subtract RDATA" interface to RdataSet

[BIND 10 Development]

#2751: add "subtract RDATA" interface to RdataSet
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  vorner
            Priority:  medium        |                       Status:
           Component:  data source   |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130917
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  5             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 But it should probably be checked at a different level in the code, maybe
 in #2752 or so.

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Ticket URL: <http://bind10.isc.org/ticket/2751#comment:11>
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