plugin categories: reorganize multiple plugins

plugins/network/bandwidth-OVH-Network

@@ -12,6 +12,7 @@ if [ "$1" = "config" ]; then
         echo 'graph_args --base 1000 -l 0'
         echo 'graph_vlabel MB/s'
         echo 'graph_scale no'
+        echo 'graph_category network'
         echo "download.label download"
         exit 0
 fi