Comment 1 for bug 1539422

The issue is current devstack plugin doesn't handle directory creation in clean way.

    if [[ ! -d $WATCHER_CONF_DIR ]]; then
        sudo mkdir -p $WATCHER_CONF_DIR
        sudo chown $STACK_USER $WATCHER_CONF_DIR
    fi

If WATCHER_CONF_DIR existed with root owner, this code doesn't change it to the right ownership. Then copying policy.json failed.

So need use "sudo install -d ..." as clean way of making directory