BIND 10 #2196: Update Auth to support differential statistics updates

[BIND 10 Development]

#2196: Update Auth to support differential statistics updates
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            Reporter:  fujiwara      |                        Owner:
                Type:  enhancement   |  fujiwara
            Priority:  medium        |                       Status:  new
           Component:  b10-auth      |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Add a new command "getstats_delta" which returns differences of statistics
 data from previous command.
 It suppresses items which values are zero.
 "getstats" and "getstats_delta" commands should be used exclusively.

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Ticket URL: <http://bind10.isc.org/ticket/2196>
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BIND 10 Development