BIND 10 #2136: update the stats daemon according to the new statistics model

[BIND 10 Development]

#2136: update the stats daemon according to the new statistics model
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                   Reporter:         |                 Owner:  UnAssigned
  naokikambe                         |                Status:  reviewing
                       Type:         |             Milestone:
  enhancement                        |  Sprint-20120807
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  statistics                         |  Estimated Difficulty:  8? (depends
                   Keywords:         |  on #2135)
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by naokikambe):

 Jinmei-san checked only the running of "make check" so far, but nobody
 reviews the source codes yet.

 BTW I've updated some codes due to the changes of the wiki page
 StatsModule. My changes to the codes are:

 * Supporting ''show_processes'' of the boss module for Stats to count
 instances of the target modules
 {{{
 3f922de [2136] Updated the do_polling method
 58b6810 [2136] Updated the "show_processes" to provide address of each
 module
 99b6098 [2136] Introduced an address() method for the Component classes
 }}}
 * Updating to invoke polling at the time when the ''show'' command of
 Stats is invoked
 {{{
 082d6a9 [2136] Updated the 'show' command handler
 }}}
 * Refactoring for efficiency
 {{{
 f8f9de2 [2136] Separated the updating process from the receiving process
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/2136#comment:15>
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