Support heat in standalone mode.

The following localrc will launch only heat in standalone mode
and allow it to provision within the openstack specified by
the configured keystone endpoint:
HEAT_STANDALONE=True
ENABLED_SERVICES=rabbit,mysql,heat,h-api,h-api-cfn,h-api-cw,h-eng
KEYSTONE_SERVICE_HOST=...
KEYSTONE_AUTH_HOST=...

Change-Id: I0d8a541fc9d592577423b074c789829f8b8d6702
diff --git a/README.md b/README.md
index 46d3f96..95c90bc 100644
--- a/README.md
+++ b/README.md
@@ -181,6 +181,23 @@
     Q_ML2_PLUGIN_VLAN_TYPE_OPTIONS   VLAN TypeDriver options. Defaults to none.
     Q_AGENT_EXTRA_AGENT_OPTS         Extra configuration options to pass to the OVS or LinuxBridge Agent.
 
+# Heat
+
+Heat is disabled by default. To enable it you'll need the following settings
+in your `localrc` :
+
+    enable_service heat h-api h-api-cfn h-api-cw h-eng
+
+Heat can also run in standalone mode, and be configured to orchestrate
+on an external OpenStack cloud. To launch only Heat in standalone mode
+you'll need the following settings in your `localrc` :
+
+    disable_all_services
+    enable_service rabbit mysql heat h-api h-api-cfn h-api-cw h-eng
+    HEAT_STANDALONE=True
+    KEYSTONE_SERVICE_HOST=...
+    KEYSTONE_AUTH_HOST=...
+
 # Tempest
 
 If tempest has been successfully configured, a basic set of smoke tests can be run as follows: