Summary:
Right now, in db_stress's CF consistency test's TestGet case, if failure happens, we do normal string printing, rather than hex printing, so that some text is not printed out, which makes debugging harder. Fix it by printing hex instead.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5989
Test Plan: Build db_stress and see t passes.
Differential Revision: D18363552
fbshipit-source-id: 09d1b8f6fbff37441cbe7e63a1aef27551226cec
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