Random failures in test setup due to "Address already in use"

bind(..) failed: Address already in use

io.netty.channel.unix.Errors$NativeIoException: bind(..) failed: Address already in use
	at io.netty.channel.unix.Errors.newIOException(Errors.java:117)
	at io.netty.channel.unix.Socket.bind(Socket.java:234)
	at io.netty.channel.epoll.EpollServerSocketChannel.doBind(EpollServerSocketChannel.java:91)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:554)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1258)
	at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:501)