Add bash completion for service create|update --network-(add|rm)

Signed-off-by: Harald Albers <github@albersweb.de>
(cherry picked from commit fa0f470a5f)
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

components/cli/contrib/completion/bash/docker

@@ -3166,6 +3166,8 @@ _docker_service_update_and_create() {
 			--host-add
 			--host-rm
 			--image
+			--network-add
+			--network-rm
 			--placement-pref-add
 			--placement-pref-rm
 			--publish-add
@@ -3192,6 +3194,10 @@ _docker_service_update_and_create() {
 				__docker_complete_image_repos_and_tags
 				return
 				;;
+			--network-add|--network-rm)
+				__docker_complete_networks
+				return
+				;;
 			--placement-pref-add|--placement-pref-rm)
 				COMPREPLY=( $( compgen -W "spread" -S = -- "$cur" ) )
 				__docker_nospace