Siying Dong 857e9960be Improve the error message for I/O related errors.
Summary:
Force people to write something other than file name while returning status for IOError.
Closes https://github.com/facebook/rocksdb/pull/2493

Differential Revision: D5321309

Pulled By: siying

fbshipit-source-id: 38bcf6c19e80831cd3e300a047e975cbb131d822
2017-06-26 12:57:01 -07:00
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