Update docker
Update docker

Changes:

- https://github.com/docker-library/docker/commit/d450514: Merge pull request https://github.com/docker-library/docker/pull/172 from infosiftr/client-key-perms
- https://github.com/docker-library/docker/commit/3068415: Widen permissions on "client/key.pem" (especially for unprivileged usage)
- https://github.com/docker-library/docker/commit/4975dca: Update to 19.03.0 GA

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