modify mosquitto configuration by drop in

[borpin]

emonpi/install/mosquitto.sh

Line 12 in cf7cac6

sudo sed -i "s/^persistence true/persistence false/" /etc/mosquitto/mosquitto.conf

As per most configurations, instead of editing a configuration file that may well be modified on upgrade, use drop in file of settings in the '/etc/mosquitto/conf.d` folder.

[borpin]

Did you do anything about this? Still a better method than modifying the base config that may be overwritten. Do you want me to open a new one on EmonScripts? openenergymonitor/EmonScripts#77