BIND 10 #1456: Create diff-normalizer utility functions

[BIND 10 Development]

#1456: Create diff-normalizer utility functions
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                   Reporter:  jelte  |                 Owner:  jelte
                       Type:  task   |                Status:  assigned
                   Priority:         |             Milestone:
  medium                             |  Sprint-20120529
                  Component:  DDNS   |            Resolution:
                   Keywords:         |             Sensitive:  0
            Defect Severity:  N/A    |           Sub-Project:  DNS
Feature Depending on Ticket:  DDNS   |  Estimated Difficulty:  5
        Add Hours to Ticket:  0      |           Total Hours:  0
                  Internal?:  0      |
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Comment (by jelte):

 Just a small update if anyone is interested in this ticket, I went a bit
 crazy and have an initial working full update now. It is not finished
 though, it contains some ugly hacks and needs logging and documentation.

 However, the diff part is quite reasonable, it is indeed extending the
 current isc.xfrin.diff to support alternating adds and deletes (with the
 two restrictions that it can then only contain 1 changeset, and not
 multiple as can happen in xfrin, and that the SOA record should still be
 the first addition and deletion). For DDNS we need to inspect the SOA
 record anyway, so in that specific case that last restriction is not much
 of a problem IMO. I intend to clean up and finish the diff part first
 thing tomorrow :) (and then pick up 1457).

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Ticket URL: <http://bind10.isc.org/ticket/1456#comment:9>
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