commands: charon: removed some old unneeded code
commands: charon: handle sigusr1 to trigger reload of vm-containers list

external process can send sigusr1 to the charon process to trigger a
reload of the vm-container which should be monitored by the daemon
commands: charon: create a pid file when starting up the process
commands: charon: stop the service
commands: stop service charon: print something if pidfile is missing
commands: charon: plugin to intecept new nodes installation
commands: charon: quick workaround to defer signaling charon
commands: charon: nicer log in charon