BIND 10 #2470: use MasterLoader in memory::ZoneDataLoader

[BIND 10 Development]

#2470: use MasterLoader in memory::ZoneDataLoader
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  jinmei
            Priority:  medium        |                       Status:
           Component:  data source   |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20121218
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  3             |                 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 jinmei):

 Replying to [comment:7 vorner]:

 > Regarding the changelog, maybe it's worth to have it. But I don't know
 if
 > user-facing channel like changelog should contain names of classes in
 the code.
 >
 > The most significant problem with the branch is, the
 master_loader_callbacks.cc
 > isn't in the repository. Could you, please, commit it?

 Oops, sorry!  Just added and pushed it.

 I'm going to address the rest of the comments separately.

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Ticket URL: <http://bind10.isc.org/ticket/2470#comment:8>
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