[python] asyncio aiohttp.ClientSession doesn't have proxy in __init__

[ntextreme3]

Description

proxy is not a valid argument to aiohttp.ClientSession. As far as I can tell, it hasn't ever been -- which makes this even more confusing, since that means this has always been wrong?

Swagger-codegen version

current

Swagger declaration file content or url

The python asyncio rest.py template is invalid

swagger-codegen/modules/swagger-codegen/src/main/resources/python/asyncio/rest.mustache

Lines 63 to 67 in 5a9f449

	if configuration.proxy:
	self.pool_manager = aiohttp.ClientSession(
	connector=connector,
	proxy=configuration.proxy
	)

Command line used for generation

--library asyncio

Steps to reproduce

Generate any async code

Related issues/PRs

None

Suggest a fix/enhancement

aiohttp.ClientSession doesn't take a proxy (although it might at some point). However, session.request does. So, possibly, just store the proxy info as part of RESTClientObject and pass it along to request in args here