Add no_proxy settings

Cherry picking this from https://github.com/kubernetes/kubernetes.github.io/pull/4108

docs/http_proxy.md

@@ -12,3 +12,10 @@ For example:
 $ minikube start --docker-env HTTP_PROXY=http://$YOURPROXY:PORT \
                  --docker-env HTTPS_PROXY=https://$YOURPROXY:PORT
 ```
+
+If your Virtual Machine address is 192.168.99.100, then chances are your proxy settings will prevent kubectl from directly reaching it.
+To by-pass proxy configuration for this IP address, you should modify your no_proxy settings. You can do so with:
+
+```shell
+$ export no_proxy=$no_proxy,$(minikube ip)
+```