Add CONFIG_CONTROLLER_HOST to heat cfn config

The if the bind_host value is not explicitly stated in the configurtion
the default is 127.0.0.1

Change-Id: Ide3f9c8bdfbfa7f4aa40ac05a8f9138ee8e3106f
Fixes: rhbz#1054353
Merge "Add CONFIG_CONTROLLER_HOST to heat cfn config"