Merge pull request #21573 from albers/completion-daemon--containerd

bash completion for `docker daemon --containerd`

contrib/completion/bash/docker

@@ -794,6 +794,7 @@ _docker_daemon() {
 		--cluster-advertise
 		--cluster-store
 		--cluster-store-opt
+		--containerd
 		--default-gateway
 		--default-gateway-v6
 		--default-ulimit
@@ -870,7 +871,7 @@ _docker_daemon() {
 			__docker_complete_log_drivers
 			return
 			;;
-		--pidfile|-p|--tlscacert|--tlscert|--tlskey)
+		--containerd|--pidfile|-p|--tlscacert|--tlscert|--tlskey)
 			_filedir
 			return
 			;;