Logger, starts logging only after USR2 signal

Simply send USR2 singal to the node process to enable/disable logging output.

process.emit('SIGUSR2', { forceDisable: true }); to clearly disable logging (doesn't matter if it was enabled or not)

process.emit('SIGUSR2', { forceEnable: true }); to apparently enable logging (doesn't matter if it was enabled or not)