Variablize the full iPXE binary

The full ipxe binary has a different name on RedHat based
based distributions, so we need to variablize the parameter
and load the correct variable accordingly.

Change-Id: Icc6f3229ed54544794b57fe26d5293724e392647

playbooks/roles/ironic-install/defaults/required_defaults_Debian.yml

@@ -4,6 +4,7 @@ init_dest_dir: /etc/init/
 init_ext: .conf
 syslinux_tftp_dir: /usr/lib/syslinux/
 ipxe_dir: /usr/lib/ipxe/
+ipxe_full_binary: ipxe.pxe
 sgabios_dir: /usr/share/qemu/
 nginx_user: www-data
 virt_group: libvirtd

playbooks/roles/ironic-install/defaults/required_defaults_RedHat.yml

@@ -4,6 +4,7 @@ init_dest_dir: /usr/lib/systemd/system/
 init_ext: .service
 syslinux_tftp_dir: /var/lib/tftpboot
 ipxe_dir: /usr/share/ipxe/
+ipxe_full_binary: ipxe.lkrn
 sgabios_dir: /usr/share/sgabios/
 nginx_user: nginx
 virt_group: libvirt

playbooks/roles/ironic-install/tasks/create_tftpboot.yml

@@ -39,9 +39,9 @@
   copy: src={{ ipxe_dir }}/undionly.kpxe dest=/tftpboot/
 # NOTE(TheJulia): Copy full iPXE chain loader images in case they are required.
 - name: "Copy full iPXE image into /httpboot"
-  copy: src={{ ipxe_dir }}/ipxe.pxe dest=/httpboot/
+  copy: src={{ ipxe_dir }}/{{ ipxe_full_binary }} dest=/httpboot/
 - name: "Copy full iPXE image into /tftpboot"
-  copy: src={{ ipxe_dir }}/ipxe.pxe dest=/tftpboot/
+  copy: src={{ ipxe_dir }}/{{ ipxe_full_binary }} dest=/tftpboot/
 # Similar logic to below can be utilized to retrieve files
 - name: "Determine if folder exists, else create and populate folder."
   stat: path=/tftpboot/master_images