BIND 10 #1985: b10-auth should get ddns UNIX socket file from ddns config

[BIND 10 Development]

#1985: b10-auth should get ddns UNIX socket file from ddns config
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  b10-auth      |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              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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 On top of #1984, b10-auth should get the UNIX socket file path
 from the ddns configuration.  We'll then be able to deprecate
 getDDNSSocketPath() introduced in #1539.

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Ticket URL: <http://bind10.isc.org/ticket/1985>
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