tests: Split run-tests.py logger info into per test case files

The run-tests.py -l argument does not take an argument value anymore.
Instead, debug output is directed to a separate file <test>.log for each
test case.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

tests/hwsim/test_ap_roam.py

@@ -9,7 +9,7 @@
 import time
 import subprocess
 import logging
-logger = logging.getLogger(__name__)
+logger = logging.getLogger()
 
 import hwsim_utils
 import hostapd