Following on the changes introduced by I98bcd17dac9a47cc19e0d9ec90176945a6d7e355
This patch updates the SSL key and cert distribution for Horizon to
use slurp & references the primary node in horizon_ssl_key_distribute.yml
when referencing the key and cert facts.
Change-Id: Ifc01d8a75b5f0ce26ca1fa754dcccffa2a7e425c
Signed-off-by: Javeria Khan <javeriak@plumgrid.com>