Revert "Remove mysql gem's"

This reverts commit cbe53217fa0c542de91cede361145be5630bc3c8.
Add mysql
Revert "Add mysql"

This reverts commit 6bd6c0267b9301611f5acd866b9b33ffb820282e.
Revert "Revert "Remove mysql gem's""

This reverts commit eadc4327f4c7ecbe317621dce95e6a41003c904f.