commit ae81c53356a94a802fe52d04c3147a9f6f0f0fa4
Author: James Tunnicliffe <james.tunnicliffe@nanosheep.org>
Date:   Fri Apr 15 13:56:23 2016 +0100

    Reboot at the end of cloudinit to activate new network configuration instead of using ifdown, ifup. This resolves cloudinit hanging when the network configuration has changed.

From: dooferlad/1.25-bridge-bug