Missing handler for logging in coordinator

[sapd]

We are using tooz for in-house tool and etcd for backend. We also enable heartbeat for group coordinator. The source code is similar to [1]

When the connection between worker and etcd is interrupted. The tooz coordinator tries to reconnect by using tenacity library [2].

We get the error: No handlers could be found for logger "tooz.coordination"

Reason: LOG in [3] does not have handler

[1] - https://github.com/openstack/tooz/blob/master/examples/group_membership.py
[2] - https://github.com/openstack/tooz/blob/master/tooz/coordination.py#L184
[3] - https://github.com/openstack/tooz/blob/master/tooz/coordination.py#L37