What does this MR do?
Disable strict mode in MySQL
Why was this MR needed?
Because otherwise it's breaking Rails 5. See: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12841#note_40884022
There's also a failed attempt at: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14383
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated - Review
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Has been reviewed by Database
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