[python] Remove post_params and body from OPTIONS request

[ghost]

https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS

Options should not have body or post_params

PR checklist

• Read the contribution guidelines.
• If contributing template-only or documentation-only changes which will change sample output, build the project before .
• Run the shell script(s) under ./bin/ (or Windows batch scripts under.\bin\windows) to update Petstore samples related to your fix. This is important, as CI jobs will verify all generator outputs of your HEAD commit, and these must match the expectations made by your contribution. You only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the code or mustache templates for a language ({LANG}) (e.g. php, ruby, python, etc).
• File the PR against the correct branch: master, 4.1.x, 5.0.x. Default: master.
• Copy the technical committee to review the pull request if your PR is targeting a particular programming language.

[ghost]

@taxpon (2017/07) @frol (2017/07) @mbohlool (2017/07) @cbornet (2017/09) @kenjones-cisco (2017/11) @tomplus (2018/10) @Jyhess (2019/01)

cc: @wing328

[ghost]

I think this build is failing because docker pull swagger/petstore is resulting in 503

[spacether]

I think this build is failing because docker pull swagger/petstore is resulting in 503

Yup, I am seeing that too on my PR. Locally running docker pull swaggerapi/petstore results in:

Using default tag: latest
Error response from daemon: received unexpected HTTP status: 503 Service Unavailable

[wing328]

There were docker outages.

Your PR looks good so I'll merge it. (and python petstore samples are tested by Travis)