Add support to optionally launch the heat service.

This allows the heat service to be started as a devstack service.

Heat is disabled by default, and can be enabled with this in your localrc:
ENABLED_SERVICES+=,heat

There is now a repo of heat-enabled images here:
https://github.com/heat-api/prebuilt-jeos-images/downloads

These can be added to the IMAGE_URLS in your localrc.

After devstack is launched, a template can be invoked with:
nova keypair-add --pub_key $HOME/.ssh/id_rsa.pub heat_key
heat -d create wordpress \
--template-file=../heat/templates/WordPress_Single_Instance.template \
--parameters="InstanceType=m1.tiny;DBUsername=wpuser;DBPassword=wppassword;\
KeyName=heat_key;LinuxDistribution=F16"

Change-Id: I07591295eb2b9eb7868b1577dd3c24b19812a689
diff --git a/files/default_catalog.templates b/files/default_catalog.templates
index 66052b6..ceb6458 100644
--- a/files/default_catalog.templates
+++ b/files/default_catalog.templates
@@ -34,3 +34,8 @@
 catalog.RegionOne.image.adminURL = http://%SERVICE_HOST%:9292
 catalog.RegionOne.image.internalURL = http://%SERVICE_HOST%:9292
 catalog.RegionOne.image.name = Image Service
+
+catalog.RegionOne.heat.publicURL = http://%SERVICE_HOST%:8000/v1
+catalog.RegionOne.heat.adminURL = http://%SERVICE_HOST%:8000/v1
+catalog.RegionOne.heat.internalURL = http://%SERVICE_HOST%:8000/v1
+catalog.RegionOne.heat.name = Heat Service