BIND 10 #2223: Update tests for code disabled in rrsetsCheck()

[BIND 10 Development]

#2223: Update tests for code disabled in rrsetsCheck()
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            Reporter:  muks          |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  libdns++      |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 As part of #2165, some code that compared vector index differences in
 `rrsetsCheck()` (in `dnsmessage_test.h`) was commented out. This code
 doesn't make sense anymore as RRSIGs are no longer inline in `Message`
 class's rrsets vector.

 A similar way of achieving the same effect as what that code checked for
 should be implemented. This could be something simple, or could mean
 modifying several tests.

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Ticket URL: <http://bind10.isc.org/ticket/2223>
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