exec vtctl helper script to avoid relaunching consul containers

Signed-off-by: jawabuu <49921621+jawabuu@users.noreply.github.com>

examples/compose/lvtctl.sh

@@ -21,4 +21,4 @@ if [[ "$OSTYPE" == "msys" ]]; then
 fi
 
 # This is a convenience script to run vtctlclient against the local example.
-exec docker-compose run vtctld vtctlclient -server vtctld:15999 "$@"
+exec $tty docker-compose exec ${CS:-vtctld} vtctlclient -server vtctld:15999 "$@"