Commits on Mar 21, 2019

1. strict staging and target directory …

   The CSI spec requires the CO (= csi-sanity) to create the staging
   directory and the *parent* of the target
   directory. Kubernetes (kubernetes/kubernetes#75535)
   and csi-sanity have handled the target directory incorrectly by
   creating it.
   
   Now directory handling is standard-compliant and more strict, to catch
   mistakes:
   - the specified target directory is treated as the parent which gets
     created by csi-sanity, while the actual NodePublishVolume call then
     specifies an entry inside that directory; this was done to keep the
     code simple (handling both directories is the same) and to minimize
     API changes
   - os.Mkdir and os.Remove are used instead of the more forgiving
     os.MkdirAll and os.RemoveAll; as a result, both directories
     now must be different (which is what they should have been in the
     anyway, it just happened to work when they were identical)
   - the mock driver checks for non-existence of the target directory

   

   pohly committed Mar 21, 2019
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