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:  jinmei        |                        Owner:
                Type:  task          |                       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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 I believe this will also help resolve various issues in xfrout such as
 busy loop-like problem.  Both auth and xfrout need to be updated, but
 that will probably be too big for a single task, so I propose we first
 update auth, only with unittests, and keeping the current code for the
 actual operation.

 Once the xfrout part is completed, we'll switch the auth part too.

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