logging: do not log into the root logger

Deprecate `ipa_log_manager.root_logger` and replace all calls to it with
module-level logger calls.

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipatests/pytest_plugins/beakerlib.py

@@ -25,12 +25,13 @@ If the plugin is active, sets up IPA logging to also log to Beaker.
 
 import logging
 
-from ipapython.ipa_log_manager import Formatter, root_logger
+from ipapython.ipa_log_manager import Formatter
 
 
 def pytest_configure(config):
     plugin = config.pluginmanager.getplugin('BeakerLibPlugin')
     if plugin:
+        root_logger = logging.getLogger()
         root_logger.setLevel(logging.DEBUG)
 
         handler = BeakerLibLogHandler(plugin.run_beakerlib_command)

ipatests/pytest_plugins/nose_compat.py

@@ -23,7 +23,7 @@ import os
 import sys
 import logging
 
-from ipapython.ipa_log_manager import Formatter, root_logger
+from ipapython.ipa_log_manager import Formatter
 
 
 def pytest_addoption(parser):
@@ -64,4 +64,5 @@ def pytest_configure(config):
         handler = LogHandler()
         handler.setFormatter(Formatter('[%(name)s] %(message)s'))
         handler.setLevel(config.getoption('logging_level'))
+        root_logger = logging.getLogger()
         root_logger.addHandler(handler)