BIND 10 #383: Generalize IOService constructor

[BIND 10 Development]

#383: Generalize IOService constructor
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  Reporter:  jelte        |            Owner:  jelte
      Type:  enhancement  |           Status:  new  
  Priority:  major        |        Milestone:       
 Component:  recurser     |         Keywords:       
 Sensitive:  0            |   Estimatedhours:  0    
     Hours:  0            |         Billable:  1    
Totalhours:  0            |         Internal:  0    
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 Currently (that is, in branch327 right now), the IOService constructor
 takes three Provider arguments.

 Two of these are highly DNS-packet-specific ('lookup', and 'answer').

 We should generalize this so modules that do not necessarily handle DNS
 queries and answers can also use our IOService class.

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Ticket URL: <https://bind10.isc.org/ticket/383>
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