[BUG] "petstore" hardcoded in tox.ini template

[lk-jeffpeck]

See here:
https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/python/tox.mustache#L19

[wing328]

Thanks for reporting the issue. I've filed #4776 to fix it.

[wing328]

PR merged. Please try again with the latest master.