Re: [jclouds] clean up logic and docs for setting proxies (#914)

[Alex Heneveld]

>        }
> +      if (config.canUseProxyFromJvm()) {
> +         return getDefaultProxy(endpoint);
> +      }
> +      if (config.useSystem()) {
> +         System.setProperty("java.net.useSystemProxies", "true");

there is a comment on the property in `Constants` to that effect

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