[core] fix lighttpd -1 one-shot graceful shutdown
[core] fix lighttpd -1 one-shot graceful shutdown

fix lighttpd -1 graceful shutdown (one-shot mode)
(regression in lighttpd 1.4.46)

gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4