[issue7808] test_bsddb3 leaks references

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

> Could you explain the changes to the unittest?

The reference to "self" in the hooks were preventing the GC of the test case, as far as I understand, because it creates a cycle.
When using weak references, there's no more dead cycles.
It is my own explanation, maybe it's not exactly what happens.

For the sys.traceback, I could not explain it better than the FAQ:
http://docs.python.org/faq/design.html#how-does-python-manage-memory

I may add a small comment in test_replication to explain the usage of weakref.

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