Is it possible to use an external etcd cluster

Would it provide additional stability to run Etcd outside of the Kubernetes cluster? If so, how can we customize the etcd member list for kops would we be able to modify this with a `kops edit cluster`?

No files, tests, or entry points are identified in the issue. Start by tracing how kops represents cluster configuration and the etcd member list, then determine whether external etcd can be configured through `kops edit cluster`; done would require a decided design and documented, working support for that configuration.

Written by the indexing model from the issue text.