[bisq-network/btcd-cli4j] Use only localhost for block notify port (#5)

[Stephan Oeste]

This needs to be fixed in btcd-cli4j. There the listen network socked is opened.

This is how I think it should work. The listen host needs to be configurable if someone needs this on an other interface listen. 

https://github.com/priiduneemre/btcd-cli4j/compare/master...Emzy:patch-1

Additionally it is good to run a firewall on the seednode. Like 

`iptables -A INPUT -i lo -j ACCEPT && iptables -A INPUT -p tcp --dport 22 -j ACCEPT && iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT && iptables -P INPUT DROP`

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