[issue30776] regrtest: change -R/--huntrleaks rule to decide if a test leaks references

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Since I rejected "false alarms" from refleak, the refleak buildbot already helped to identify a reference leak regression.

Except that now it may hide actual regressions... False negatives are not better than false positives.

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<http://bugs.python.org/issue30776>
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