add openshift_master_api_port var to example inventory

would get timeouts during master node installation without this setting

playbooks/aws/provisioning-inventory.example.ini

@@ -11,6 +11,7 @@ etcd
 openshift_deployment_type=origin
 
 openshift_master_bootstrap_enabled=True
+openshift_master_api_port=443
 
 openshift_hosted_router_wait=False
 openshift_hosted_registry_wait=False