The path module has a few different functions:
Clean, Split, Join, Ext, Dir, Base, IsAbs. These functions do not
take into account the OS-specific path separator, meaning that they
won't behave as intended on Windows.
For example, Dir is supposed to return all but the last element of the
path. For the path "C:\some\dir\somewhere", it is supposed to return
"C:\some\dir\", however, it returns ".".
Instead of these functions, the ones in filepath should be used instead.
To preserve fix in https://github.com/kubernetes/kubernetes/pull/110670,
add an unit test that check a volume is *uncertain* even after final mount
error when it was reconstructed.
And actually fix a regression introduced in the previous patch.
