BIND 10 #2435: implement datasrc version of RRsetCollection

[BIND 10 Development]

#2435: implement datasrc version of RRsetCollection
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            Reporter:  jinmei        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  reviewing
           Component:  data source   |                    Milestone:
            Keywords:                |  Sprint-20130122
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  4             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 If you choose to define `RRsetCollection` to be created from updater,
 it looks just confusing to have a separate definition for
 `datasrc::RRsetCollection`.  What we should do (or at least what I
 envisioned) is to think about pros and cons of both approaches, pick
 one and only one of them and implement it.

 Also, if the decision is to extend the updater, we should generally
 need more doc than this:
 {{{#!cpp
     /// Return an RRsetCollection for the updater.
     virtual isc::dns::RRsetCollectionPtr getRRsetCollection() = 0;
 }}}
 (unless it's already planned).  Sometimes a one-liner brief doc is the
 best we can have, but that should be very rare except for trivial
 getter/setter.

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Ticket URL: <http://bind10.isc.org/ticket/2435#comment:10>
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