BIND 10 #1551: in-memory datasource allow RRSIG, NSEC, and CNAME at same time

[BIND 10 Development]

#1551: in-memory datasource allow RRSIG, NSEC, and CNAME at same time
-------------------------------------+-------------------------------------
                   Reporter:  jreed  |                 Owner:  jinmei
                       Type:         |                Status:  accepted
  defect                             |             Milestone:
                   Priority:  major  |  Sprint-20120207
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  4
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 trac1551 is ready for review.

 This should be simple enough.  (So I also added a couple of unrelated
 cleanups).

 One note if it's not obvious: I made this branch after merging
 trac1574b.  This branch doesn't depend on 1574b, but modifies the
 same file, so (assuming 1574b is close to merge) I thought it's better
 to do so we can reduce the risk of having conflict at merge time.  The
 first commit is for the merge and should be ignored.

 Another note: the case for CNAME+RRSIG was already covered in #1614.
 But I added an explicit test for that in this branch.

 This is the proposed changelog entry:
 {{{
 373.?   [bug]           jinmei
         libdatasrc: the in-memory data source incorrectly rejected loading
         a zone containing a CNAME RR with RRSIG and/or NSEC.
         (Trac #1551, git TBD)
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/1551#comment:6>
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