bpo-30830: test_logging uses threading_setup/cleanup (#3137)

bpo-30830: test_logging uses threading_setup/cleanup (#3137)

* bpo-30830: test_logging uses threading_setup/cleanup

Replace @support.reap_threads on some methods with
support.threading_setup() in setUp() and support.threading_cleanup()
in tearDown() in BaseTest.

* bpo-30830: test_logging disables threaded socketserver tests

Disable tests because of socketserver.ThreadingMixIn leaks threads,
whereas leaking threads now makes a test to fail on buildbots.

Disable tests until socketserver is fixed: bpo-31233.

* Skip also setup_via_listener()