[M. UPDATE] net/py-zmq 17.1.2 to 18.0.0

[Elias M. Mariani]

https://pyzmq.readthedocs.io/en/latest/changelog.html

- Update bundled libzmq to 4.3.1 (fixes CVE-2019-6250)
https://nvd.nist.gov/vuln/detail/CVE-2019-6250

Regression tests on consumers are working equal with this version and
the previous one.

Comments ? OKs ?
Elias.

py-zmq-18.0.0.diff
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