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zmq: Add support to listen on multiple interfaces
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Authored by PiRK on Oct 14 2021, 07:45.

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Reviewers
Fabien
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rABC8b7ad5234871: zmq: Add support to listen on multiple interfaces
Summary

This PR adds support for ZeroMQ to listen on multiple interfaces, just like the RPC server.
Currently, if you specify more than one e.g. zmqpubhashblock paramter, only the first one will be used. Therefore a user may be forced to listen on all interfaces (e.g. zmqpubhashblock=0.0.0.0:28332), which can result in an increased attack surface.
With this PR a user can specify multiple interfaces to listen on, e.g.
-zmqpubhashblock=tcp://127.0.0.1:28332 -zmqpubhashblock=tcp://192.168.1.123:28332.

This is a backport of core#18309

Test Plan

ninja all check-all

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