[draft][19.03 backport] Remove "docker engine" subcommands #2829
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Backport of #2207
alternative to / closes #2828
Opening this for discussion; These subcommands were created to allow upgrading a Docker Community engine to Docker Enterprise, but with the move of the enterprise products to Mirantis, these commands were no longer working; the images used to distribute the "enterprise" engine are no longer updated, and the latest versions available on docker hub are outdated (and may have unpatched vulnerabilities, so should not be recommended to use).
Reference documentation for these subcommands were already removed from docs.docker.com, and removing these commands (even as part of a patch release) may be the best option.
addresses #2213