* adding retries option to override default value 3 of urllib3
* running petstore for python
* adding files for samples in petstore run
* running ensure-up-to-date
* Adds v2 spec additionalproperties examples, adds v3 spec nulllable model example, updates samples
* Remaining samples updates
* Adds csharp generator update to handle models with multilevel parent types, which works for the AdditionalPropertiesObject model, samples updated
* The `ApiClient` will now have support to store and use HTTP Cookies (as APIKey auth).
* Use Cookie authentication for user management.
* - Updated Python related samples.
* Issue 1766 Modified mustache files for Go to support nullable in the spec v3.0+; Updated model files running .sh scripts for Go.
* Add "nullable" to fake yaml
* Add sample script for OAS3
* Fix output folder (openapi3)
* Run bin/openapi3/go-petstore.sh
* Update samples
* Update jaxrs-jersey
* Update python and php samples
* Add bin/openapi3/go-gin-petstore-server.sh
* Run bin/openapi3/go-gin-petstore-server.sh
* Update bin/openapi3/go-petstore-server.sh to generate "nullable" samples
* Run bin/openapi3/go-petstore-server.sh
* Fix duplicated `import`
* add multiple server support to python client
* various fixes
* minor fixes, add tests
* test oas2 python first
* fix tests
* fix issues reported by flake8
* update code format
* add python petstore to ensure up-to-date
* rearrange test
* fix E501
* fix tests
* add new files
* fix script permission
* fix index check
* update samples