CC-4974: Watchdog for ensuring Liquidsoap does not consume more than 1GB of memory

-changed to 600MB for now. May lower even more later

python_apps/pypo/liquidsoap_scripts/ls_script.liq

@@ -1,10 +1,12 @@
-%include "library/pervasives.liq"
 %include "/etc/airtime/liquidsoap.cfg"
 
 set("log.file.path", log_file)
 set("log.stdout", true)
 set("server.telnet", true)
 set("server.telnet.port", 1234)
+set("init.daemon.pidfile.path", "/var/run/airtime-liquidsoap.pid") 
+
+%include "library/pervasives.liq"
 
 #Dynamic source list
 #dyn_sources = ref []