Make Docker registry use an immutable path
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From https://gitlab.slack.com/archives/C02PF508L/p1524676496000391:
Right now the Docker registry path is tied to the namespace/project name. This allows Docker registry images to be sensible: e.g. registry.gitlab.com/gitlab-org/gitlab-build-images.
However, this means users can't rename their usernames if there are container registry tags because we don't have a way to rename all the tags to the new path.
Ideally, we would be able to store the Docker registry paths in some immutable path (e.g. the hashed storage path) and map the friendly namespace/project path. However, @ayufan mentions:
well, hashed storage is tricky, as it will not work with content signatures
and for having hashed storage we would have to provide an abstraction layer to translate requests from one format to another
/cc: @balasankarc, @bkc