BIND 10 #1746: cleanup: remove "temporary" SQLite3Accessor::getRecordDiff()

[BIND 10 Development]

#1746: cleanup: remove "temporary" SQLite3Accessor::getRecordDiff()
-------------------------------------+-------------------------------------
            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 As commented in the header file:
 {{{#!c++
     // A short term method for tests until we implement more complete
     // API to retrieve diffs (#1330).  It returns all records of the diffs
 ...
     // in favor of brevity.  Once #1330 is completed, this method must be
     // removed, and the tests using this method must be rewritten using
 the
     // official API.
 }}}

 #1330 was completed much before but apparently we forgot to do this
  cleanup.  We should do it now.

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Ticket URL: <http://bind10.isc.org/ticket/1746>
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