Update policy docker version per latest manifest

Change-Id: I4c93ee48f7adc303173aaa70bd22181d9aba2954
Issue-ID: POLICY-486
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>

heat/ONAP/onap_openstack.env

@@ -133,7 +133,7 @@ parameters:
   appc_docker: v1.2.0
   so_docker: v1.1.2
   dcae_docker: v1.1.1
-  policy_docker: v1.1.2
+  policy_docker: v1.1.3
   portal_docker: v1.3.0
   robot_docker: 1.1-STAGING-latest
   sdc_docker: v1.1.0