config/plugin: Add template for plugins

suricata.yaml.in

@@ -71,6 +71,10 @@ stats:
   # Add stream events as stats.
   #stream-events: false
 
+# Plugins -- Experimental -- specify the filename for each plugin shared object
+plugins:
+#   - /path/to/plugin.so
+
 # Configure the type of alert (and other) logging you would like.
 outputs:
   # a line based alerts log similar to Snort's fast.log