BIND 10 #525: handle "singleton" RR types

[BIND 10 Development]

#525: handle "singleton" RR types
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            Reporter:  jinmei        |                        Owner:
                Type:  enhancement   |  pselkirk
            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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Changes (by muks):

 * owner:  muks => pselkirk


Comment:

 Only one RDATA is meaningful for an SOA. But the tests construct an
 `RRset` with multiple RDATA to test if our code works properly when such a
 case is encountered.

 Although `RRset` allows construction with multiple RDATA for SOA, there
 are checks in other places in the code that prevent this from happening
 during zone loading, transfers and updates. These are tested in unittests,
 and such tests construct SOA `RRsets` with multiple RDATA. Only the tests
 use it this way.

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Ticket URL: <http://bind10.isc.org/ticket/525#comment:10>
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