BIND 10 #1462: check SOA serial in xfrout

[BIND 10 Development]

#1462: check SOA serial in xfrout
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20111220
                  Component:         |            Resolution:
  xfrout                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  3
Feature Depending on Ticket:  AXFR-  |           Total Hours:  0
  out                                |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 - xfrout.py compares serials as integers, which is not correct.  we
   need to use isc.dns.Serial objects.  See xfrin.
 - before doing that, add a test case that fails due to the integer
   comparison (e.g. 0xffffffff "<" 1).  see, again, xfrin.  Then make
   the above change, and then confirm it fixes the problem.
 - ixfr-to-axfr test cases shouldn't be removed (we need to change the
   test parameters and check the fallback behavior, not just remove it).
 - I believe we need a changelog for it.

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Ticket URL: <http://bind10.isc.org/ticket/1462#comment:8>
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