Truncated dir name can't give any useful information, print whole dir name will. Bad debug log is like this: ``` DEBU[2449] aufs error unmounting /var/lib/doc: no such file or directory ``` Signed-off-by: Zhang Wei <zhangwei555@huawei.com> Upstream-commit: af8359562c9561afad0a05e66386588d17788804 Component: engine