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 naokikambe):

 Replying to [comment:5 jelte]:
 Thank you! When I was working for newly adding {{{test_utils.py}}}, I
 sometime experienced the case that the unittest didn't work when I omitted
 the argument of the {{{join()}}} or when I set the non-zero value in the
 argument. e.g. The threads never stopped, or it continued waiting until it
 took the specified seconds. It couldn't wait for so long time if each
 module in each thread was instantly exited. I didn't think that the issue
 was caused because the threads were used in the stats unittest. Anyway I
 don't know exactly whether this issue is same as that issue or not.
 Regards,

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Ticket URL: <http://bind10.isc.org/ticket/1668#comment:6>
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