iniset_rpc_backend default section

iniset_rpc_backend should know what section it needs to set the
config options in better than the callers. The config options
have actually been moved to different sections and the options
in the DEFAULT section are deprecated.

Change-Id: I0e07fe03c7812ef8df49e126bf71c57588635639
diff --git a/lib/heat b/lib/heat
index a088e82..d713f18 100644
--- a/lib/heat
+++ b/lib/heat
@@ -105,7 +105,7 @@
     cp $HEAT_DIR/etc/heat/policy.json $HEAT_POLICY_FILE
 
     # common options
-    iniset_rpc_backend heat $HEAT_CONF DEFAULT
+    iniset_rpc_backend heat $HEAT_CONF
     iniset $HEAT_CONF DEFAULT heat_metadata_server_url http://$HEAT_API_CFN_HOST:$HEAT_API_CFN_PORT
     iniset $HEAT_CONF DEFAULT heat_waitcondition_server_url http://$HEAT_API_CFN_HOST:$HEAT_API_CFN_PORT/v1/waitcondition
     iniset $HEAT_CONF DEFAULT heat_watch_server_url http://$HEAT_API_CW_HOST:$HEAT_API_CW_PORT