BIND 10 #1668: redo threaded stats tests with mocksessions

[BIND 10 Development]

#1668: redo threaded stats tests with mocksessions
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                   Reporter:  jelte  |                 Owner:
                       Type:  task   |                Status:  new
                   Priority:  major  |             Milestone:  Year 3 Task
                  Component:         |  Backlog
  statistics                         |            Resolution:
                   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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Comment (by jelte):

 Another related issue has come up:

 http://git.bind10.isc.org/~tester/builder//BIND10/20120213154001-Debian5Linux-i686/logs/unittests.out

 (if you run these tests often enough on a system with some load you're
 bound to see this error at some point too)

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Ticket URL: <http://bind10.isc.org/ticket/1668#comment:2>
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