Add coreos.live.rootfs_url boot parameter

Add missing parameter to allow fetching the root filesystem during boot.
The boot argument relies on IRONIC_IP and HTTP_PORT being set properly.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>

ironic-config/inspector.ipxe.j2

@@ -5,6 +5,6 @@ echo In inspector.ipxe
 imgfree
 # NOTE(dtantsur): keep inspection kernel params in [mdns]params in
 # ironic-inspector-image and configuration in configure-ironic.sh
-kernel --timeout 60000 http://IRONIC_IP:HTTP_PORT/images/ironic-python-agent.kernel ipa-insecure=1 ipa-inspection-collectors=default,extra-hardware,logs systemd.journald.forward_to_console=yes BOOTIF=${mac} ipa-debug=1 ipa-enable-vlan-interfaces={{ env.IRONIC_INSPECTOR_VLAN_INTERFACES }} ipa-inspection-dhcp-all-interfaces=1 ipa-collect-lldp=1 EXTRA_ARGS initrd=ironic-python-agent.initramfs {% if env.IRONIC_RAMDISK_SSH_KEY %}sshkey="{{ env.IRONIC_RAMDISK_SSH_KEY|trim }}"{% endif %} {{ env.IRONIC_KERNEL_PARAMS|trim }} || goto retry_boot
+kernel --timeout 60000 http://IRONIC_IP:HTTP_PORT/images/ironic-python-agent.kernel ipa-insecure=1 ipa-inspection-collectors=default,extra-hardware,logs systemd.journald.forward_to_console=yes BOOTIF=${mac} ipa-debug=1 ipa-enable-vlan-interfaces={{ env.IRONIC_INSPECTOR_VLAN_INTERFACES }} ipa-inspection-dhcp-all-interfaces=1 ipa-collect-lldp=1 EXTRA_ARGS initrd=ironic-python-agent.initramfs coreos.live.rootfs_url=http://IRONIC_IP:HTTP_PORT/images/ironic-python-agent.rootfs {% if env.IRONIC_RAMDISK_SSH_KEY %}sshkey="{{ env.IRONIC_RAMDISK_SSH_KEY|trim }}"{% endif %} {{ env.IRONIC_KERNEL_PARAMS|trim }} || goto retry_boot
 initrd --timeout 60000 http://IRONIC_IP:HTTP_PORT/images/ironic-python-agent.initramfs || goto retry_boot
 boot