Updated openstack/openstack
Project: openstack-dev/devstack  7a68f21b296464aed54da7e3c8f3e5de238ce61d

Simplify ironic-python-agent download

The kernel and ramdisk for IPA are now uploaded separately, this
commit simplifies the download by downloading them separately.

Change-Id: I630b0a9c3d1179a6b97754f1474f62ae7da068a5