cmd/docker: add tests for flag-completions, and refactor #5542
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Remove the registerCompletionFuncForGlobalFlags for now, as the error it returned was ignored, so it didn't add much benefit, other than abstracting things.
Split the underlying completion-functions to separate functions, and add some basic tests for them.
Remove the completions helper, as it now didn't add much, and it saved having the dependency on the package.
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