[issue27787] Avoid test_main() in test_httplib; gc.collect() dangling threads

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7ddbc2263943 by Martin Panter in branch '3.5':
Issue #27787: Clean up weak references before checking for dangling threads
https://hg.python.org/cpython/rev/7ddbc2263943

New changeset e5777c5d108c by Martin Panter in branch 'default':
Issue #27787: Merge regrtest fixup from 3.5
https://hg.python.org/cpython/rev/e5777c5d108c

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nosy: +python-dev

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