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:  defect        |  UnAssigned
            Priority:  low           |                       Status:
           Component:  dhcp-ddns     |  reviewing
            Keywords:                |                    Milestone:  DHCP-
           Sensitive:  0             |  Kea0.9-alpha
         Sub-Project:  DHCP          |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  2             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  2
                                     |                    Internal?:  0
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Changes (by tmark):

 * hours:  0 => 2
 * owner:  tmark => UnAssigned
 * status:  assigned => reviewing
 * totalhours:  0 => 2


Comment:

 Added a check in D2Process to detect when D2 is using an address other
 than loopback on which to listen and issue a log warning.

 Added simple unit tests that permit visual log inspection barring a
 simple, automated way to do it.

 Not sure if we need a !ChangeLog entry or not, but if so I suggest this:

 {{{
 7xx.    [func]      tmark
     If b10-dhcp-ddns is configured to listen on an address other than
     loop back, it will issue a log message warning the user that this is
     insecure and is supported for testing purposes only.
     (Trac #3383,    git  TBD)
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/3383#comment:2>
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