Serialize remote version query over LE

Some devices (ex. Nexus Player remote) do not take well to having the
remote version queried while a remote feature request is also sent and
subsequently fail encryption.

This patch serializes the query of the remote version and requires both
remote features and the remote version to be read before calling a
connection established.

Bug: 25357767
Change-Id: Ie70eea241b47b81778d8e0df47f3a8f376316932