BIND 10 #930: update stats modules to get statistics list from cfgmgr, and define the list in spec file of each module

[BIND 10 Development]

#930: update stats modules to get statistics list from cfgmgr, and define the
list in spec file of each module
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            Reporter:  naokikambe    |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    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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 After #928 and #929, stats modules can get the statistics list from cfgmgr
 instead of local stats-spec file. So update stats modules for this, and
 define the statistics items in spec file of each module.

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Ticket URL: <https://bind10.isc.org/ticket/930>
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