refactor(mod): remove the /etcd/ prefix

Originally we were going to move all of the API endpoints to /etcd/ so
that you could move etcd traffic over a multiplexed HTTP proxy with
other service but since we don't have a strong use case for this just
remove this for now.
Merge pull request #300 from philips/remove-etcd-from-mod

refactor(mod): remove the /etcd/ prefix