Handle capture on redefined http.responseWriters

cmd/traefik/traefik.go

...ation/fixtures/simple_metrics_with_buffer_middleware.toml

integration/simple_test.go

pkg/middlewares/accesslog/logger.go

pkg/middlewares/accesslog/logger_test.go

pkg/middlewares/capture/capture.go

pkg/middlewares/capture/capture_test.go

pkg/middlewares/metrics/metrics.go

pkg/server/middleware/chainbuilder.go

pkg/server/router/router_test.go

pkg/server/routerfactory_test.go