[all][dev] python-etcd3 needs maintainers

Going through my todo list after returning from travels and I'm reminded of:

When I was at OpenInfraDays UK, Louis Taylor (aka kragniz) asked me if I could check with the OpenStack community to see if there are people who are actively using python-etcd3 [1] that are interested in helping to maintain it. It needs more attention than he is able to give.

python-etcd3 is a "Python client for the etcd API v3" over GRPC so more v3-native than etcd3-gateway [2].

I've used python-etcd3 in etcd-compute and it works well. I've been hoping to contribute in my Copious Free Time but don't seem to have any.

[1] https://github.com/kragniz/python-etcd3 [2] https://github.com/dims/etcd3-gateway