Suggestion: ability to use aio-lib-cloudmanager with a HTTP proxy

I have a suggestion - hopefully that's the right place.

In some corporate intranets it is only possible to access the cloudmanager api through a proxy. In such a situation it would be very helpful if aio-lib-cloudmanager would support that. As of version 1.0.0 it's not possible to do that with aio-lib-cloudmanager , though the underlying httpclient framework nicely supports that. That is, it's not possible without either modifying the aio-lib-cloudmanager code, or pulling some really nasty tricks like modifying the private final field apiClient in CloudManagerApi ...
Thanks a lot!

BTW: I needed to use the ApacheConnectorProvider for the ApiClient to use a proxy, JettyConnectorProvider would probably work, too.

#### Platform and Version

java8 aio-lib-cloudmanager version 1.0.0 on, well, Java 8

まず、CloudManagerApi が private final apiClient をどのように作成または受け取るかを追跡し、次に ApiClient の基盤となるプロキシサポートと、issue で言及されている ApacheConnectorProvider および JettyConnectorProvider のオプションを確認します。完了条件は、呼び出し側が private フィールドを変更したり workaround を使ったりせずに、aio-lib-cloudmanager 経由で HTTP プロキシアクセスを設定できることです。

索引モデルが issue の本文から書いたものです。