Add bash completion for `docker service ps --all`

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

contrib/completion/bash/docker

@@ -2587,7 +2587,7 @@ _docker_service_ps() {
 
 	case "$cur" in
 		-*)
-			COMPREPLY=( $( compgen -W "--filter -f --help --no-resolve --no-trunc --quiet -q" -- "$cur" ) )
+			COMPREPLY=( $( compgen -W "--all -a --filter -f --help --no-resolve --no-trunc --quiet -q" -- "$cur" ) )
 			;;
 		*)
 			local counter=$(__docker_pos_first_nonflag '--filter|-f')