Fix Import/Export milestone and 1to1 models issue
Fix 1to1 relations on project failing to be importing and milestone ordering issue.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/22585
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CHANGELOG entry 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
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Squashed related commits together