BIND 10 #2267: new generateRRsetFromIterator doesn't handle RRSIGs correctly

[BIND 10 Development]

#2267: new generateRRsetFromIterator doesn't handle RRSIGs correctly
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:         |             Milestone:
  defect                             |  Sprint-20120925
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:  data   |           Sub-Project:  DNS
  source                             |  Estimated Difficulty:  6
                   Keywords:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 trac2267 is ready for review.

 This is basically a straightforward implementation of the description.
 I ended up introducing a helper "Loader" class.  The important
 behavior is implemented in that class.

 I've made some additional cleanups.  See commits that have "cleanup"
 in the commit log.

 no plan to add changelog as the bug didn't exist in released versions.

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Ticket URL: <http://bind10.isc.org/ticket/2267#comment:6>
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