The etcd service protocol is currently configured with internal_protocol.
The etcd service is not load balanced by a HAProxy container, so
there is no proxy layer to do TLS termination when internal_protocol
is configured to be "https".

Until the etcd service is configured to deploy with native TLS
termination, the etcd uses should be independent of
internal_protocol, and "http" by default.

Change-Id: I730c02331514244e44004aa06e9399c01264c65d
Closes-Bug: 1884137