BIND 10 #2921: update ConfigurableClientList to support generation ID

[BIND 10 Development]

#2921: update ConfigurableClientList to support generation ID
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  data source   |  Tasks
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 Hmm, maybe we don't need this: since generation ID is the top level
 item, while `ConfigurableClientList` is created and maintained per
 class, it's probably more sensible if the module manages the ID by
 itself.  But I'll keep this ticket at the moment.

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Ticket URL: <http://bind10.isc.org/ticket/2921#comment:1>
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