BIND 10 #3175: Move d2::StateModel class(es) to lib::util

[BIND 10 Development]

#3175: Move d2::StateModel class(es) to lib::util
-------------------------------------+-------------------------------------
                   Reporter:  tmark  |                 Owner:
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  DHCP
                   Priority:  low    |  Outstanding Tasks
                  Component:  dhcp-  |              Keywords:
  ddns                               |             Sensitive:  0
               CVSS Scoring:         |           Sub-Project:  DHCP
            Defect Severity:  N/A    |  Estimated Difficulty:  0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Per review comments from #3156, the d2::StateModel class and related
 pieces should be moved to lib::util.  This will make it available for use
 outside of D2.

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Ticket URL: <http://bind10.isc.org/ticket/3175>
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