Proxy for gnet built in.

[gitmko0]

With reference to this issue:
gnet-io/gnet-examples#2

Can't wait to see it works! I will be first to contribute actual use case for gnet.
It'll be a serious game changer for proxy like software such as haproxy etc

[xscode-auto-reply]

Thanks for opening a new issue. The team has been notified and will review it as soon as possible.
For urgent issues and priority support, visit https://xscode.com/panjf2000/gnet

[gitmko0]

Will be great if can do bandwidth throttling, like incorporate this, or an in built function
https://github.com/efarrer/iothrottler/

[panjf2000]

Duplicate #120