Support MultiThreadIoEventLoopGroup for Netty 4.2+ compatibility#2170

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AsyncHttpClient:mainAsyncHttpClient/async-http-client:mainfrom

dduttaCodePractice:fix/support-netty-4.2-multithreadio-eventloopgroupdduttaCodePractice/async-http-client:fix/support-netty-4.2-multithreadio-eventloopgroupCopy head branch name to clipboard