#17163: test_file now works with unittest test discovery.  Patch by Zachary Ware.
#17163: merge with 3.3.
#17143: fix a missing import in the trace module.  Initial patch by Berker Peksag.
#17143: merge with 3.3.
Issue #17208: add a note about the termination behaviour of daemon threads.
Issue #17208: add a note about the termination behaviour of daemon threads.
Issue #17208: add a note about the termination behaviour of daemon threads.
#17178: update any()/all() docstrings to document their behavior with empty iterables.  Patch by Ankur Ankan.
#17178: merge with 3.2.
#17178: merge with 3.3.