BIND 10 #2862: update b10-auth to recognize data source memory segments

[BIND 10 Development]

#2862: update b10-auth to recognize data source memory segments
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  b10-auth                           |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
  shared memory data source          |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Subtask of #2830.  Depend on #2861

 When the main thread knows the data sources are ready, it gets a list
 of some info of the data sources using the API added in #2835.

 In this task, we'll do the first part of (the reader side of)
 http://bind10.isc.org/wiki/SharedMemoryIPC#a5.1.InitialStartup
 that is, if there's any WAITING state of segment, subscribe to the
 !MemorySegmentReaders group.

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Ticket URL: <http://bind10.isc.org/ticket/2862>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development