BIND 10 #191: Implement a initial version of stats

[BIND 10 Development]

#191: Implement a initial version of stats
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      Reporter:  naokikambe  |        Owner:  jelte               
          Type:  task        |       Status:  reviewing           
      Priority:  major       |    Milestone:  y2 6 month milestone
     Component:  statistics  |   Resolution:                      
      Keywords:              |    Sensitive:  0                   
Estimatedhours:  20.0        |        Hours:  0.5                 
      Billable:  0           |   Totalhours:  4.83                
      Internal:  0           |  
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Changes (by naokikambe):

  * hours:  0.0 => 0.5
  * totalhours:  4.83 => 5.33


Comment:

 - I removed the implement of ''increase'' command and related test codes
 due to the decision of #170([comment:ticket:170:26]). Please see r3046.
  - I created a new ticket #347: Implement query counters in auth module.
 Please discuss about the implement of statistics features on auth module
 in #347. It is out of scope here. Please see #347.

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Ticket URL: <https://bind10.isc.org/ticket/191#comment:20>
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