CloseIdleConnections for wrapped Transport
CloseIdleConnections for wrapped Transport

It iterates over the wrapped transports until it finds one
that implements the CloseIdleConnections method and executes it.

add test for closeidle http1 connections

add test for http1.1 reconnect with inflight request

add test to reuse connection request

add test for request connect after timeout

add test for client-go request concurrency

Kubernetes-commit: b9d865a8185b62d83e9ff81b0e3499a26ac6960d

kubernetes/apimachinery