ASGI - Cache Middleware and some view decorators broken

[Michael Galler]

The cache middleware is broken because it inherits from MiddlewareMixin and override the init method.

TypeError: object HttpResponse can't be used in 'await' expression

On both middlewares the self._async_check() is missing in init.

Also the most view decorators are broken on async views, because the dont use async/await.

For example:

cache_control
xframe_options_deny
vary_on_cookie