config: fix the default log level in tcmu.conf
Note: This patch maybe lost monthes ago.
# 3: INFO
# 4: DEBUG
# 5: DEBUG SCSI CMD
-# And the default logging level is 2, if you want to change the
+# And the default logging level is 3, if you want to change the
# default level, uncomment it and set your level number:
-# log_level = 2
+# log_level = 3
#
# Logging Directory Path
# The default logging Directory path is /var/log/, uncomment it
