[Release 1.21] /var/lib/rancher/k3s/storage should not be world-readable

[dereknola]

Backport changing local storage permissions from #2348

[rancher-max]

Validated on release-1.21 branch commit 267adf64dc96fe64e3b27149b1b0b69b4842ece9

Only changes were made to items within the storage directory.

• /var/lib/rancher/k3s/storage directory has 0755 permissions
• Items within storage directory correctly have 0700 permissions

$ ls -la /var/lib/rancher/k3s/storage/
total 16
drwxr-xr-x 4 root root 4096 Jul  9 22:10 .
drwxr-xr-x 6 root root 4096 Jul  9 21:57 ..
drwx------ 2 root root 4096 Jul  9 21:57 pvc-6401329b-e2f1-4c47-9e1d-cb86fe3abbd8_default_local-path-pvc
drwx------ 2 root root 4096 Jul  9 22:10 pvc-86c318f1-6c64-4908-9bc9-c5368fbca0e6_default_other-path-pvc

$ stat -c %a /var/lib/rancher/k3s/storage/
755

$ stat -c %a /var/lib/rancher/k3s/storage/pvc-6401329b-e2f1-4c47-9e1d-cb86fe3abbd8_default_local-path-pvc/
700

$ stat -c %a /var/lib/rancher/k3s/storage/pvc-86c318f1-6c64-4908-9bc9-c5368fbca0e6_default_other-path-pvc/
700