remove double 'docker stop'

integration_tests/mysql/cleanup.sh

@@ -10,6 +10,6 @@ for version in $MYSQL_VERSIONS; do
     docker logs --tail all $CONTAINER_NAME
     echo ")}] END DOCKER LOGS FROM $CONTAINER_NAME"
     echo "Stopping $CONTAINER_NAME..."
-    docker stop docker stop $CONTAINER_NAME
+    docker stop $CONTAINER_NAME
     echo "...stopped."
 done