Fixes rabbit_hosts entries in heat.conf

Previously, heat::rabbit_hosts was missing from the HA data
mappings.  This causes the required list of controller names and
rabbit ports to be absent from rabbit_hosts= in heat.conf.

Change-Id: Iad7bd2cd7a3a2692a339c9003e8928e3016f3ec9
Merge "Fixes rabbit_hosts entries in heat.conf"