Hazelcast, Flask Gunicorn with Eventlet hangs

HI,

We are trying to use Hazelcast in Flask service. This service runs with gunicorn using `eventlet` workers. When used with this configuration, client never connects, when switching to `sync` worker, everything works fine. I pdbed into reactor and found that queue is patched with queue from `eventlet`.

I guess questions are:
* Is there a way to fix this?
* Are any gunicorn async workers supported with Hazelcast e.g. `gevent`?

* Python=3.6
* Hazelcast = 3.12.1