BIND 10 #2179: Update Stats to support differential statistics updates

[BIND 10 Development]

#2179: Update Stats to support differential statistics updates
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            Reporter:  naokikambe    |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  statistics    |  Tasks
           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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 According to StatsModule#Differentialstatisticsupdates, update the stats
 module to support differential statistics updates.

 When the target module returns statistics data, the stats module should
 replace the existent one with the new one if it already has existent
 statistics data of the corresponding name. That is, the method
 ''update_statistics_data'' in {{{stats.py}}} should be updated.

 This ticket depends on #2136. So this updating should be done based on the
 branch trac2136 if it hasn't merged with the master branch yet.

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Ticket URL: <http://bind10.isc.org/ticket/2179>
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BIND 10 Development