BIND 10 #2787: avoid hardcoding "IXFR" and "AXFR" in xfrin

[BIND 10 Development]

#2787: avoid hardcoding "IXFR" and "AXFR" in xfrin
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  xfrin         |  Sprint-Proposed
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  2             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 libdns++ is now smarter and knows how to convert such meta types to a
 string.

 This ticket will be actually resolved in #2252, so we can close this one
 as a duplicate.  (I'm going to do that).

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Ticket URL: <http://bind10.isc.org/ticket/2787#comment:3>
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