bash completion for `docker daemon --oom-score-adjust`

Signed-off-by: Harald Albers <github@albersweb.de>
(cherry picked from commit e1e310ea1fc47488a7404e3fa52fa606fe270ed0)
Signed-off-by: Tibor Vass <tibor@docker.com>

contrib/completion/bash/docker

@@ -912,6 +912,7 @@ _docker_daemon() {
 		--max-concurrent-downloads
 		--max-concurrent-uploads
 		--mtu
+		--oom-score-adjust
 		--pidfile -p
 		--registry-mirror
 		--storage-driver -s