Sets up NOVNC with https when using SSL on HORIZON

Change-Id: If56a4dd0190d32eaba319404063dd959c508c9c3
Fixes: rhbz#1115896
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
(cherry picked from commit 338d08bc2005ee3f53659c0f3d7c294bda85fb4a)