BIND 10 #2432: define and implement base and libdns++ version of RRsetCollection

[BIND 10 Development]

#2432: define and implement base and libdns++ version of RRsetCollection
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  vorner
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130108
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  5             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 Replying to [comment:19 muks]:
 > Rather than have `RRsetCollection` as an implementation, how about
 renaming:
 >
 > * `RRsetCollection` to `RRsetCollectionSimple`
 > * `RRsetCollectionBase` to `RRsetCollection`
 >
 > Derived classes can have the implementation types suffixed to the name
 such as `RRsetCollectionDataSrc`.

 Nevermind about this. It looks like we use namespaces to distinguish the
 two.

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Ticket URL: <http://bind10.isc.org/ticket/2432#comment:21>
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