Exit with shutdown when 'EXIT' shutdown is received.
Exit with shutdown when 'EXIT' shutdown is received.

Supervisor shutdown message should cause the handler
loop to exit with the reason shutdown.

ubf/ubf,hibari/ubf,hibari/ubf,ubf/ubf,ubf/ubf,cloudian/ubf,cloudian/ubf,hibari/ubf,cloudian/ubf,hibari/ubf