[Python] Support _preload_content flag in python client #4166
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PR checklist
./bin/to update Petstore sample so that CIs can verify the change. (For instance, only need to run./bin/{LANG}-petstore.shand./bin/security/{LANG}-petstore.shif updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates)2.3.0branch for breaking (non-backward compatible) changes.Description of the PR
In order to support streaming responses, we need the API Client not to read response content and return a Response object. urllib3 has a flag called preload_content that if set to False, it will return a urllib3.HTTPResponse. This PR add support for this flag in rest client and api client and generated api classes. The flag is optional and defaulted to True to keep current behavior.