Add bash completion for `--no-legacy-registry`

Signed-off-by: Harald Albers <github@albersweb.de>

contrib/completion/bash/docker

@@ -526,6 +526,7 @@ _docker_daemon() {
 		--ip-masq=false
 		--iptables=false
 		--ipv6
+		--no-legacy-registry
 		--selinux-enabled
 		--userland-proxy=false
 	"