Merge "ironic: default to ipxe booting"

ansible/group_vars/all/ironic

ansible/group_vars/all/kolla

ansible/roles/kolla-ansible/defaults/main.yml

ansible/roles/kolla-ansible/templates/kolla/globals.yml

ansible/roles/kolla-ansible/templates/overcloud-services.j2

ansible/roles/kolla-ansible/vars/main.yml

ansible/roles/kolla-openstack/defaults/main.yml

dev/functions

etc/kayobe/kolla.yml

playbooks/kayobe-overcloud-base/overrides.yml.j2

releasenotes/notes/ironic-default-ipxe-063a5a24dc9c38f0.yaml

roles/kayobe-diagnostics/files/get_logs.sh