Add bash completion for `network ls --filter scope`

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

contrib/completion/bash/docker

@@ -2717,6 +2717,10 @@ _docker_network_ls() {
 			__docker_complete_networks --cur "${cur##*=}" --name
 			return
 			;;
+		scope)
+			COMPREPLY=( $( compgen -W "global local swarm" -- "${cur##*=}" ) )
+			return
+			;;
 		type)
 			COMPREPLY=( $( compgen -W "builtin custom" -- "${cur##*=}" ) )
 			return
@@ -2725,7 +2729,7 @@ _docker_network_ls() {
 
 	case "$prev" in
 		--filter|-f)
-			COMPREPLY=( $( compgen -S = -W "driver id label name type" -- "$cur" ) )
+			COMPREPLY=( $( compgen -S = -W "driver id label name scope type" -- "$cur" ) )
 			__docker_nospace
 			return
 			;;