BIND 10 #1175: find another solution to synchronize between threads used in unittests for stats

[BIND 10 Development]

#1175: find another solution to synchronize between threads used in unittests for
stats
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            Reporter:  naokikambe    |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:  statistics    |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 As we discussed in #930, time.sleep() is used to synchronize between
 threads used in unittests for stats. It is not appropriate. Because in our
 buildbots, the timer is inaccurate and timeout might be not enough. And
 the sleep slows down the tests.

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Ticket URL: <http://bind10.isc.org/ticket/1175>
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