[bisq-network/bisq] Allow IPv6 connections to Bitcoin nodes (#4045)

[James Cox]

> Why are you using Tor for DNS if Use Tor for Bitcoin network is not checked?

Bisq is not using Tor when that option is unchecked.  However Java is defaulting to IPv4 for the name lookup.  Setting the following [option](https://stackoverflow.com/questions/20262587/where-to-set-java-net-preferipv6addresses-true#20262705) with the JavaVM is necessary to make Java default to IPv6 in the case where both address types are available.    `-Djava.net.preferIPv6Addresses=true`

![image](https://user-images.githubusercontent.com/47253594/76818592-fd151880-67d3-11ea-9e9d-c2e19302774b.png)

Success!

![image](https://user-images.githubusercontent.com/47253594/76818301-43b64300-67d3-11ea-8e2d-90fd297787b8.png)



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