Commit id's in merge request discussion should link to commit view

In a merge request when I see a commit SHA in the discussion view I want to be able to open it in the commit view, not in the merge request interface.

Merge request discussion Where I wanted to go Where I end up
20181005_screenshot_1 20181005_screenshot_2 20181005_screenshot_3

Proposal

TBD

Links / references

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