LittleProxy leaves non-daemon thread if it fails to start because of a port already in use

[suzukieng]

If LittleProxy is started and a port that is already in use is specified, a RuntimeException wrapping the BindException will be thrown (see stack trace below).

That's fine, but what shouldn't be IMHO is that leaves a non-daemon thread behind, in this case the thread named "LittleProxy-0-ClientToProxyAcceptor-0".

This will prevent an orderly JVM shutdown.

at sun.nio.ch.Net.bind0(Native Method) ~[?:?]
	at sun.nio.ch.Net.bind(Net.java:455) ~[?:?]
	at sun.nio.ch.Net.bind(Net.java:447) ~[?:?]
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227) ~[?:?]
	at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:128) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:501) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1218) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:496) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:481) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:965) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:210) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:355) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:399) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:446) ~[netty-all-4.0.44.Final.jar:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131) ~[netty-all-4.0.44.Final.jar:?]
	at java.lang.Thread.run(Thread.java:834) ~[?:?]