The changes include:
- Change to debug logging level for resources after processed.
- Remove a todo for pod cgroup cleanup.
- Add an anyhow context to `get_paths_and_mounts()`.
- Remove code which denys access to VMROOTFS since it won't take effect. If
blackmode is in use, the VMROOTFS will be denyed as default. Otherwise,
device cgroups won't be updated in whitelist mode.
- Add a unit test for `default_allowed_devices()`.
Signed-off-by: Xuewei Niu <niuxuewei.nxw@antgroup.com>