Update Horizon to use NEUTRON instead of QUANTUM

Change-Id: Iabfdd583ee0515a01fb50d9bb2ff42588e313593
Closes-Bug: #1365610
sets novnc endpoint uri to https if tls is enabled

If novnc proxy is being served behind stunnel then the uri
sent to user needs to be an https endpoint. This patch checks if
stunnel is set and makes the relevant change

Change-Id: Ib6a498e469a8ce470c1e376b45efd8103e6f508e
Merge "Update Horizon to use NEUTRON instead of QUANTUM"
Merge "sets novnc endpoint uri to https if tls is enabled"