Commits on May 15, 2020

1. csi: improve plugin error messages and volume validation …

   Some CSI plugins don't return much for errors over the gRPC socket
   above and beyond the bare minimum error codes. This changeset improves
   the operator experience by unpacking the error codes when available
   and wrapping the error with some user-friendly direction.
   
   Improving these errors also revealed a bad comparison with
   `require.Error` when `require.EqualError` should be used in the test
   code for plugin errors. This defect in turn was hiding a bug in volume
   validation where we're being overly permissive in allowing mount
   flags, which is now fixed.

   

   tgross committed May 15, 2020
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