Set up NOVNC with https when using SSL on HORIZON

Change-Id: I98d053f2d1558f39fe116a7f90bc6f1b6a4f93f4
Fixes: rhbz#1115896
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
(cherry picked from commit b9cf4bf7e56aea4669dc9b92e52ed4e0c694a32a)