BIND 10 #2381: revise dns::masterLoad using MasterLoader class

[BIND 10 Development]

#2381: revise dns::masterLoad using MasterLoader class
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  high          |                       Status:  new
           Component:  libdns++      |                    Milestone:
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  3             |  Feature Depending on Ticket:
         Total Hours:  0             |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 The tests still fail when re-enabled btw due to the trailing comment. It
 needs to be checked why the `generic::DNSKEY` string constructor is still
 being called.

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Ticket URL: <http://bind10.isc.org/ticket/2381#comment:9>
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