Differential D7338

[backport#15209] zmq: log outbound message high water mark when reusing socket
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Authored by majcosta on Sep 3 2020, 15:29.

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deadalnix

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rABC6ad4149e5d61: [backport#15209] zmq: log outbound message high water mark when reusing socket

Summary

zmq: log outbound message high water mark when reusing socket (fanquake)

Pull request description:

Running master with `src/bitcoind -zmqpubhashblockhwm=12345 -zmqpubrawtx=tcp://127.0.0.1:28332 -zmqpubhashtxhwm=5000 -zmqpubrawblock=tcp://127.0.0.1:28332 -zmqpubhashtx=tcp://127.0.0.1:28332 -zmqpubhashblock=tcp://127.0.0.1:28332 -debug=zmq`:
```
2019-01-19T14:11:01Z zmq: version 4.3.1
2019-01-19T14:11:01Z zmq: Initialize notification interface
2019-01-19T14:11:01Z zmq: Outbound message high water mark for pubhashblock at tcp://127.0.0.1:28332 is 12345
2019-01-19T14:11:01Z zmq: Notifier pubhashblock ready (address = tcp://127.0.0.1:28332)
2019-01-19T14:11:01Z zmq: Reusing socket for address tcp://127.0.0.1:28332
2019-01-19T14:11:01Z zmq: Notifier pubhashtx ready (address = tcp://127.0.0.1:28332)
2019-01-19T14:11:01Z zmq: Reusing socket for address tcp://127.0.0.1:28332
2019-01-19T14:11:01Z zmq: Notifier pubrawblock ready (address = tcp://127.0.0.1:28332)
2019-01-19T14:11:01Z zmq: Reusing socket for address tcp://127.0.0.1:28332
2019-01-19T14:11:01Z zmq: Notifier pubrawtx ready (address = tcp://127.0.0.1:28332)
```

This PR:
```
2019-01-19T14:06:57Z zmq: version 4.3.1
2019-01-19T14:06:57Z zmq: Initialize notification interface
2019-01-19T14:06:57Z zmq: Outbound message high water mark for pubhashblock at tcp://127.0.0.1:28332 is 12345
2019-01-19T14:06:57Z zmq: Notifier pubhashblock ready (address = tcp://127.0.0.1:28332)
2019-01-19T14:06:57Z zmq: Reusing socket for address tcp://127.0.0.1:28332
2019-01-19T14:06:57Z zmq: Outbound message high water mark for pubhashtx at tcp://127.0.0.1:28332 is 5000
2019-01-19T14:06:57Z zmq: Notifier pubhashtx ready (address = tcp://127.0.0.1:28332)
2019-01-19T14:06:57Z zmq: Reusing socket for address tcp://127.0.0.1:28332
2019-01-19T14:06:57Z zmq: Outbound message high water mark for pubrawblock at tcp://127.0.0.1:28332 is 1000
2019-01-19T14:06:57Z zmq: Notifier pubrawblock ready (address = tcp://127.0.0.1:28332)
2019-01-19T14:06:57Z zmq: Reusing socket for address tcp://127.0.0.1:28332
2019-01-19T14:06:57Z zmq: Outbound message high water mark for pubrawtx at tcp://127.0.0.1:28332 is 1000
2019-01-19T14:06:57Z zmq: Notifier pubrawtx ready (address = tcp://127.0.0.1:28332)
```

Backport of Core PR15209

Test Plan