BIND 10 #1867: use util::io::SocketSessionForwarder for passing xfr from auth to xfrout

[BIND 10 Development]

#1867: use util::io::SocketSessionForwarder for passing xfr from auth to xfrout
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  b10-auth                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by vorner):

 The question here is, if we're going to update the msgq system (I hope we
 do, I'm getting tired of its problems), I'd like it to have an ability to
 send file descriptors in-bound. In such case, it would be nice to use
 that, possibly?

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Ticket URL: <http://bind10.isc.org/ticket/1867#comment:2>
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