Set more explicit error message when network config is missing in etcd #1606
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Description
The PR makes the error message more explicit when flannel config is not found in etcd.
It suggests to check that the config is stored using etcdv3 API since users might not have noticed that we changed the version we are using.
It also removes completely the custom error
errKeyNotFoundwhich is a duplicate ofrpctypes.ErrGRPCKeyNotFound.Todos
Release Note