BIND 10 #748: Remove coroutines from IOFetch

[BIND 10 Development]

#748: Remove coroutines from IOFetch
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           Reporter:  stephen      |                      Owner:
               Type:  enhancement  |                     Status:  new
           Priority:  minor        |                  Milestone:
          Component:  resolver     |                   Keywords:
          Sensitive:  0            |  Estimated Number of Hours:  0
Add Hours to Ticket:  0            |                  Billable?:  1
        Total Hours:  0            |                  Internal?:  0
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 Remove the coroutine code from io_fetch.{cc,h}.

 This involves removing the inheritance from the "coroutine" objects and
 breaking down the operator() method into a number of separate methods
 corresponding to each phase of the I/O.  (This may involve the use of
 boost::bind to specify the asynchronous I/O callbacks.)

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Ticket URL: <http://bind10.isc.org/ticket/748>
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