Install api-paste.ini and policy.json

This is related to this Heat change, and Heat on Devstack will not work
while only one of these changes is applied:
Consolidated api-paste.ini file
https://review.openstack.org/#/c/27384/

Change-Id: Iba02b56173f796de5348289247233c8765f83ac2
diff --git a/lib/heat b/lib/heat
index b9d0ee5..cd0a204 100644
--- a/lib/heat
+++ b/lib/heat
@@ -64,6 +64,11 @@
     HEAT_API_CW_PORT=${HEAT_API_CW_PORT:-8003}
     HEAT_API_HOST=${HEAT_API_HOST:-$SERVICE_HOST}
     HEAT_API_PORT=${HEAT_API_PORT:-8004}
+    HEAT_API_PASTE_FILE=$HEAT_CONF_DIR/api-paste.ini
+    HEAT_POLICY_FILE=$HEAT_CONF_DIR/policy.json
+
+    cp $HEAT_DIR/etc/heat/api-paste.ini $HEAT_API_PASTE_FILE
+    cp $HEAT_DIR/etc/heat/policy.json $HEAT_POLICY_FILE
 
     # Cloudformation API
     HEAT_API_CFN_CONF=$HEAT_CONF_DIR/heat-api-cfn.conf