tests: Don't add StreamHandler to logger

Adding this handler causes at least 2 problems:
- pytest captures logging calls by itself, so every log is captured
    twice - once in stderr, once in stdlog
- logging calls in atexit handlers fail - as they are trying to write to
    a closed stream.

Original purpose of the code seems to be to allow log capture for nose,
but we no longer use nose. It also specified log level and format - but
those can be specified using pytest.ini (which this commit also adds),
so the code can be removed now.

Author: Lorak-mmk

pytest.ini

@@ -0,0 +1,4 @@
+[pytest]
+log_format = %(asctime)s.%(msecs)03d %(levelname)s [%(module)s:%(lineno)s]: %(message)s
+log_level = DEBUG
+log_date_format = %Y-%m-%d %H:%M:%S

tests/__init__.py

@@ -21,13 +21,6 @@
 from concurrent.futures import ThreadPoolExecutor
 
 log = logging.getLogger()
-log.setLevel('DEBUG')
-# if nose didn't already attach a log handler, add one here
-if not log.handlers:
-    handler = logging.StreamHandler()
-    handler.setFormatter(logging.Formatter('%(asctime)s %(levelname)s [%(module)s:%(lineno)s]: %(message)s'))
-    log.addHandler(handler)
-
 
 def is_eventlet_monkey_patched():
     if 'eventlet.patcher' not in sys.modules: