BIND 10 #3383: Add a warning log when D2 is configured to listen on something other than local loopback

[BIND 10 Development]

#3383: Add a warning log  when D2 is configured to listen on something other than
local loopback
-------------------------------------+-------------------------------------
                   Reporter:  tmark  |                 Owner:
                       Type:         |                Status:  new
  defect                             |             Milestone:  DHCP-
                   Priority:  low    |  Kea0.9-alpha
                  Component:  dhcp-  |              Keywords:
  ddns                               |             Sensitive:  0
               CVSS Scoring:         |           Sub-Project:  DHCP
            Defect Severity:  N/A    |  Estimated Difficulty:  4
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Until some form of authenticated communications is implemented, D2 should
 issue a warning message to the log if it is configured to listen on
 something besides the local loop back interface.  The
 message should say something similar to:

 "The DHCP-DDNS server has been configured to listen at an address other
 than the loopback address (127.0.0.1 or ::1).  This is not secure and is
 intended for testing purposes only."

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Ticket URL: <http://bind10.isc.org/ticket/3383>
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BIND 10 Development