BIND 10 #525: handle "singleton" RR types

[BIND 10 Development]

#525: handle "singleton" RR types
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            Reporter:  jinmei        |                        Owner:
                Type:  enhancement   |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20131015
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  0.0           |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 I think no `ChangeLog` entry is necessary as it is not something
 externally visible. `addRdata()` does throw an additional exception now
 (which is documented).

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Ticket URL: <https://bind10.isc.org/ticket/525#comment:4>
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