BIND 10 #2875: Implement the multi-process and layered cache approach

[BIND 10 Development]

#2875: Implement the multi-process and layered cache approach
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            Reporter:  vorner        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  resolver      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130723
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  7             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by vorner):

 * owner:  vorner => UnAssigned
 * status:  accepted => reviewing


Comment:

 It is ready for review.

 I based it on the #2874 branch, because it uses coroutines as well.

 I tried only one way of IPC, any idea of other to use?

 I think we'll need to tweak the parameters of the generated queries so the
 experiments are more conclusive (for example having more smaller queries,
 and having bigger cache hit ration).

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Ticket URL: <http://bind10.isc.org/ticket/2875#comment:4>
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