Upgrade error level for deprecation attributes
Upgrade error level for deprecation attributes

Summary: Make deprecation messages firmer.

Reviewed By: WillerZ

Differential Revision: D10855134

fbshipit-source-id: 181bc0ed6d5ccaefdca22264182e8fbe47c1a9b9

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly