from_env: Use default base_url if no environment is given #372
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The PodmanClient class has its own mechanism to detect the default value for base_url if no specific value is provided. However this mechanism can't be used when creating an instance by from_env, because from_env requires (DOCKER|CONTAINER)_HOST environment.
This drops the validation from from_env, so that users can use from_env without explicitly setting the HOST environment.