BIND 10 #928: Add statistics category into spec file of each module, and update cfgmgr to handle it

[BIND 10 Development]

#928: Add statistics category into spec file of each module, and update cfgmgr to
handle it
-------------------------------------+-------------------------------------
            Reporter:  naokikambe    |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:                |  Tasks
  configuration                      |                     Keywords:
           Sensitive:  0             |              Defect Severity:  N/A
         Sub-Project:  DNS           |  Feature Depending on Ticket:
Estimated Difficulty:  0             |          Add Hours to Ticket:  0
         Total Hours:  0             |                    Internal?:  0
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 Each module instead of stats module should have statistics items in its
 own spec file as result of the discussion of [comment:3:ticket:719]. So
 add a new category "statistics" in spec file of each module, and update
 cfgmgr to handle it. A proposed data structure of the spec file is:
 {{{
 { "module_spec": {
     "module_name": "my_own_module",
     "module_description": "foo",
     "config_data": [ <list of configurable options> ],
     "commands": [ <list of commands> ],
     "statistics": [ <list of collected statistics> ]
   }
 }
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/928>
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BIND 10 Development