Remove oj as we're not using it
What does this MR do?
Remove oj as we're not using it
Why was this MR needed?
As pointed out in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17694#note_63821682 we're not using it, and I don't feel it's worth the troubles to use it.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17694