BIND 10 #2540: DHCP cleanup: cfgmgr -> cfg_mgr, remove Doxygen errors

[BIND 10 Development]

#2540: DHCP cleanup: cfgmgr -> cfg_mgr, remove Doxygen errors
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                   Reporter:  tomek  |                 Owner:
                       Type:         |                Status:  new
  defect                             |             Milestone:  DHCP
                   Priority:  very   |  Outstanding Tasks
  low                                |              Keywords:
                  Component:  dhcp   |             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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 This is a result of #2270 review. Some things were pushed to this ticket
 to avoid complex merge (2270 is based on old code that had everything in
 src/lib/dhcp, which is not split into two dirs).

 To do:
 - rename cfgmgr.{cc|h} to cfg_mgr.{cc|h}
 - remove all outstanding Doxygen errors

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Ticket URL: <http://bind10.isc.org/ticket/2540>
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