Remove --name flag from service update

The --name flag was inadvertently added to
docker service update, but is not supported,
as it has various side-effects (e.g., existing
tasks are not renamed).

This removes the flag from the service update
command.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

contrib/completion/bash/docker

@@ -2576,7 +2576,6 @@ _docker_service_update() {
 		--log-driver
 		--log-opt
 		--mount
-		--name
 		--network
 		--publish -p
 		--replicas
@@ -2608,6 +2607,7 @@ _docker_service_update() {
 		options_with_args="$options_with_args
 			--container-label
 			--mode
+			--name
 		"
 
 		case "$prev" in