BIND 10 #595: Refactor function MessageEntry::getRRsetTrustLevel()

[BIND 10 Development]

#595: Refactor function MessageEntry::getRRsetTrustLevel()
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           Reporter:  zhanglikun     |                      Owner:
               Type:  defect         |  zhanglikun
           Priority:  major          |                     Status:  new
          Component:  resolver       |                  Milestone:  R-Team-
          Sensitive:  0              |  Sprint-20110308
Add Hours to Ticket:  0              |                   Keywords:
        Total Hours:  0              |  Estimated Number of Hours:  0
                                     |                  Billable?:  1
                                     |                  Internal?:  0
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 Refactor the function according the discussion in bind10-dev.
 If there is only CNAME record in answer section,

 Only the CNAME record with owner name same as query name should be treated
 as authoritative, other records should be treated as not authoritative.

 It's same with DNAME, the difference is,  except DNAME record is
 authoritative, the CNAME has the same trust as the DNAME being synthesised
 from it.

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Ticket URL: <http://bind10.isc.org/ticket/595>
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