Revert "upgrade databases to MySQL 5.7"
Revert "upgrade databases to MySQL 5.7"

This reverts commit fcde371c2c9f60bbc907ed324cedb520e1a87444.

gozer/voice-web,gozer/voice-web,gozer/voice-web,gozer/voice-web,gozer/voice-web,common-voice/common-voice,gozer/voice-web,common-voice/common-voice,gozer/voice-web,common-voice/common-voice,common-voice/common-voice