BIND 10 #2645: Create class for DUID generation

[BIND 10 Development]

#2645: Create class for DUID generation
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                   Reporter:  tomek  |                 Owner:
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  DHCP
                   Priority:  low    |  Outstanding Tasks
                  Component:  dhcp6  |              Keywords:
               CVSS Scoring:         |             Sensitive:  0
            Defect Severity:  N/A    |           Sub-Project:  DHCP
Feature Depending on Ticket:         |  Estimated Difficulty:  0
        Add Hours to Ticket:  0      |           Total Hours:  0
                  Internal?:  0      |
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 There is currently a code written in Dhcp6_srv (loadServerID,
 generateServerID, writeServerID) to handle DUID creation and management.
 It was pointed out in #2597 that it should probably be done in a separate
 class.

 Naive approach would be to move this to DUID class, but that would include
 dependency on DUID to also use IfaceMgr. It would also make this code and
 its dependency included in other projects that possibly don't care about
 DUID generation, e.g. relay.

 It should be also pointed out that the DHCPv6 client uses exactly the same
 approach to generate client-id.

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Ticket URL: <http://bind10.isc.org/ticket/2645>
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BIND 10 Development