allow reading configuration files from /system/addon.d

* OTA compat in System Mode for nanodroid-overlay
* allow reading config files when /data can't be mounted from recovery

CommonInstaller

@@ -10,7 +10,7 @@ STORAGE=/data/media/0
 curdate=$(date +%Y%m%d_%H.%M.%S)
 nanodroid_logfile="${STORAGE}/nanodroid_logs/${MODID}_${VERSION}_log_${curdate}.log"
 
-config_locations="${STORAGE} /external_sd /sdcard /sdcard1 /data /tmp"
+config_locations="${STORAGE} /external_sd /sdcard /sdcard1 /data /system/addon.d /tmp"
 
 nanodroid_all_init='"10_sqlite 20_fstrim 30_logcat 40_external_sd 50_logscleaner"'
 

Full/system/bin/nanodroid-overlay

@@ -216,7 +216,7 @@ overrides_genconfig () {
 }
 
 # check for configuration files
-config_locations="/data/media/0 /external_sd /sdcard1 /data /tmp"
+config_locations="/data/media/0 /external_sd /sdcard1 /data /tmp /system/addon.d"
 media_rw=$(grep "^/dev/block.*/mnt/media_rw" /proc/mounts \
 	| cut -d " " -f 2 \
 	| cut -d "/" -f 4)