[issue21137] Better repr for threading.Lock()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The repr of threading._RLock contains owner and count, but not lock/unlock status. The repr of locks from _dummy_thread also should contain lock/unlock status. And it would be nice to have the open/closed status in the repr of other synchronization primitives: Condition, Semaphore, etc. 

As for tests, I think assertRegex() will produce more useful error report.

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nosy: +serhiy.storchaka
stage:  -> patch review

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<http://bugs.python.org/issue21137>
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