Fix ErrMessageCallback test flakyness
Summary: Need to use `readAll` to ensure that we've read in all bytes that were written (up to EOF). Current approach sometimes returns after only a partial read. Reviewed By: yfeldblum Differential Revision: D15456484 fbshipit-source-id: f36a596a3557d4d3714bfaa3c33c726d81ccb5a4
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