MQTT/Homie set behaviour

[rlkoshak (Rich Koshak)]

Add that to the end of $OH_USERDATA/etc/org.ops4j.pax.logging.cfg. See the following for details:

• https://www.openhab.org/docs/administration/logging.html#logging-in-openhab
• https://www.openhab.org/docs/administration/logging.html#logging-into-separate-file
• Log4j2 Sample Config