Updated openstack/openstack
Project: openstack-infra/devstack-gate  c388f21508ba150d4065b8e85ac0ed3ea20328a4

Remove ramdisk build option for Ironic agent driver

This was overlooked when Ironic gained the ability to set
IRONIC_BUILD_DEPLOY_RAMDISK in devstack-gate.

Change-Id: Id8f8dced716baca7e6ab8a209cddd59bb6783673