Integration/refactor declarative policy
What does this MR do?
Merges https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10515
Are there points in the code the reviewer needs to double check?
That the policies themselves make sense and implement the logic we want.
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together