Pat Ferate eb019c2dad Handle missing storage files (#576) ...

* Move `validate_file` to `oauth2client.util`
* Warn user if storage file is missing
* Raise an `IOError` exception if the given filename is a directory.
* Raise an `IOError` exception if the given filename is a symbolic link.
      (Previously raised `CredentialsFileSymbolicLinkError`)
* (test) Expanding single-letter variables
* (test) `assertEqual(None, <obj>)` -> `assertIsNone(<obj>)`
* (test) `assertNotEqual(None, <obj>)` -> `assertIsNotNone(<obj>)`

2016-08-01 09:49:02 -07:00

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