Updated openstack/openstack
Project: openstack-dev/devstack  4bd4264960917b6bcd197326020a8a894d1d47f4

Allow devstack to build ironic agent ramdisk

This provides a way to test Ironic-python-agent code that is
not yet merged.

Change-Id: I85084c383263173a33250592a95a17f46827b347