[issue7849] Improve "test_support.check_warnings()"

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

"lazy" sounds like a bad name for that parameter. It makes me think of lazy evaluation, not error checking.

There's also the problem that check_py3k_warnings() will check all DeprecationWarnings, not only py3k-specific ones. We need a Py3kDeprecationWarning subclass.
Besides, there doesn't seem to be any point accepting positional arguments in check_py3k_warnings(). If you want a custom filter, just use check_warnings() instead.

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nosy: +benjamin.peterson, pitrou

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