Add serverSocket.setReuseAddress(true);

[jonathanjonathan001]

@safstromo - could you check on your Linux system that this works?

Fixes #90

[safstromo]

Seems to work for me! 👍

[kappsegla]

After careful reading of ServerSocket documentation I think that the setReuseAddress(true) has to be set before binding the socket. Therefor we can't use the constructor that automatically binds to a port, because then it's too late to change SO_REUSEADDR.
A better implementation that should work might be:
try (ServerSocket socket = new ServerSocket()) { socket.setReuseAddress(true); socket.bind(new InetSocketAddress(6379));

This changes the status of reuse address before binding happens.

[sonarcloud]

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