Enable delay_auth_decision for swift/auth_token.

- Add delay_auth_decision=1 in swift proxy configuration to allow
  anonymous access or tempurl.

Rebased

Change-Id: I6a97d0ff6d24a3ffef56d3d426683e48206eff71
diff --git a/stack.sh b/stack.sh
index 974b2cf..e19f274 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1556,6 +1556,7 @@
 admin_tenant_name = ${SERVICE_TENANT_NAME}
 admin_user = swift
 admin_password = ${SERVICE_PASSWORD}
+delay_auth_decision = 1
 EOF
     if is_service_enabled swift3;then
         cat <<EOF>>${SWIFT_CONFIG_PROXY_SERVER}