bpo-37153: test_venv.test_mutiprocessing() calls pool.terminate() (GH-13816) (GH-13819)

test_venv.test_mutiprocessing() now explicitly calls pool.terminate()
to wait until the pool completes.
(cherry picked from commit bc6469f79ca13217b784fb47da7ec83484a3debe)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
2 files changed