Support IPv6 for zmq connection between master and worker #2521
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This is a follow up for PR #2290.
The solution is based on http://api.zeromq.org/4-2:zmq-setsockopt.
The test is done with kind for 3 env, ipv4 only, ipv6 only and dual stack. With help of https://abdelrhmanhamouda.github.io/locust-k8s-operator/
Test result:
ipv4-only before-patch(success) after-patch(success)
ipv6-only before-patch(fail, the worker can't connect with master) after-patch(success)
dualstack before-patch(success) after-patch(success)