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:  Next-
            Keywords:                |  Sprint-Proposed
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  3             |              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 muks):

 The following testcases may have been disabled by #2387 as they fail
 because the test data has trailing comments and (eventually) uses the
 string RDATA constructor which doesn't support comments:
 {{{
 [  FAILED  ] MasterLoadTest.loadRRWithComment
 [  FAILED  ] MasterLoadTest.loadRRWithCommentNoSpace
 [  FAILED  ] MasterLoadTest.loadRRWithCommentEmptyComment
 [  FAILED  ] MasterLoadTest.loadRRWithCommentEmptyCommentNoSpace
 }}}

 These tests should be fixed and re-enabled when fixing this bug, or
 deleted.

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Ticket URL: <http://bind10.isc.org/ticket/2381#comment:5>
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