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

[STINNER Victor]

STINNER Victor added the comment:

Real-world examples of false positives from the x86 Gentoo Refleaks 2.7 buildbot:

http://buildbot.python.org/all/builders/x86%20Gentoo%20Refleaks%202.7/builds/32/steps/test/logs/stdio

test_nntplib leaked [0, 85, 0] references, sum=85
test_multiprocessing leaked [0, 0, -35] references, sum=-35

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