CLOUDSTACK-5453: Fix VPN connection monitoring in KVM

It's broken by:

commit 7f104b1feb489ae09b1a2060262a122deda44a8e
Author: Edison Su <sudison@gmail.com>
Date: Fri Oct 12 18:24:50 2012 -0700

    [PATCH] CLOUDSTACK-335: fix lb for vpc on kvm