BIND 10 #931: Implement signing part in b10-auth

[BIND 10 Development]

#931: Implement signing part in b10-auth
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            Reporter:  vorner        |                        Owner:
                Type:  task          |  vorner
            Priority:  major         |                       Status:  new
           Component:  Unclassified  |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:  tsig
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 This is the final part of #875. This will implement signing the responses
 when they go out. This uses code from #925, even if it is not merged yet.

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Ticket URL: <http://bind10.isc.org/ticket/931>
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