fix bug: scheduler's projects size change in subthread while main thread iterate #842
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ThreadBaseScheduler's _update_project function update projects attribute in seperate thread.
if Python quit child thread to run main thread til <for project in itervalues(projects)> in _check_select function,it will raise runtime exception.
I'm not familiar with python,please check it!
when I run scheduler in Ubuntu16.04,python 2.7.14 ,the python process will crashed with Segment Fault or GC fault ,I don't know if related to this PR.