context: minor refactoring and fixes #3887
Merged
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cli: NewTopLevelCommand: don't use unnamed assignments
This prevents unexpected bugs if fields are added/moved.
cli/command: remove DockerCli.loadConfigFile()
This makes it more transparent what's happening.
cli/command: DockerCli: keep reference to options for later use
Store a reference to the options in the client, so that they are available for later use.