BIND 10 #2153: change Message::addRRset param to ConstRRsetPtr

[BIND 10 Development]

#2153: change Message::addRRset param to ConstRRsetPtr
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  libdns++      |                    Milestone:
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  2             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 This is still not possible as we call `setTTL()` method on the passed
 `RRset`.

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Ticket URL: <http://bind10.isc.org/ticket/2153#comment:4>
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