Refactor the code, moving the hostpath helper functionality to new
"pkg/utils/hostpath" package. This breaks odd-ish dependency
"pkg/utils" -> "source".
* fix linter issues for few files
* fix linter issue of exported const Name should have comment or be unexported
* fix name lint issue and resolve lints
* add changes to comments
Get rid of distracting error in the log in case selinux is not enabled
in the kernel. Still print an error only if sysfs/fs directory is not
available, though, which indicates that we're not able to correctly
detect the presence of selinux.
Remove the 'selinux' feature source and move the functionality under the
'kernel' feature source. The selinux feature label is changed to
feature.node.kubernetes.io/selinux.enabled
The selinux feature source was rather narrow in scope, and, the sole
feature it advertised naturally falls under the kernel feature source.
