This refreshes the ipxe build makefile to build an image
that works in both legacy BIOS and UEFI environments.
This makes the following changes:
- Moves the ipxe submodule commit to current master
- Creates an EFI partition efi.img containing ipxe.efi
as the default binary
- Builds ipxe-boot.img as an MBR/GPT hybrid ISO which boots
and runs iPXE in both legacy BIOS and UEFI environments
- Stop creating ipxe-boot.qcow2 since the conversion from
ipxe-boot.img has an incorrect EFI partition, and there is
no real benefit over the raw image anyway
- Refresh the documentation for how to upload the images to
an OpenStack cloud, remove the redundancy from ipxe/README
Change-Id: I720ed5aaa0d55ded73e01aaba9db66602adc26cd
ce863ae11c