[ironic] Enable ipxe boot interface

By default, enable ipxe to support multi-arch deployment. Nodes
still have to declare that they use ipxe versus pxe, or set a
default_boot_interface.

kolla/defaults.yml

@@ -124,6 +124,7 @@ keystone_federation_oidc_allowed_redirects:
 
 # Ironic
 enable_ironic: yes
+enable_ironic_ipxe: yes
 ironic_provisioning_network: ironic-provisioning
 ironic_provisioning_network_cidr: 10.51.0.0/24
 ironic_provisioning_network_gateway: "{{ ironic_provisioning_network_cidr | ipaddr('next_usable') }}"

kolla/node_custom_config/ironic.conf

@@ -1,4 +1,5 @@
 [DEFAULT]
+enabled_boot_interfaces = ipxe,pxe
 enabled_console_interfaces = ipmitool-shellinabox,ipmitool-socat,no-console
 default_console_interface = ipmitool-socat
 enabled_network_interfaces = flat,neutron
@@ -8,7 +9,6 @@ default_storage_interface = cinder
 enabled_management_interfaces = ipmitool,noop
 default_management_interface = ipmitool
 
-
 [conductor]
 # We do not perform automated cleaning to improve turnaround time on a node.
 automated_clean = False