Xinliang Liu b6e057d694 Use distro provided GRUB efi
Use distro provided GRUB efi instead of creating it like ironic GRUB
setup doc[1]. This avoids below ubuntu ironic-python-agent images PXE
booting failure.
----------
error: invalid magic number.
error: you need to load the kernel first.

Press any key to continue...
----------

This also fixes x86_64 uefi pxe booting issue by setting up GRUB efi
for x86_64.

Besides, GRUB setup only needs to do once at bootstrap stage.

[1]:
https://docs.openstack.org/ironic/train/install/configure-pxe.html#uefi-pxe-GRUB-setup

Closes-Bug: #1879265
Change-Id: I8be5bdf5f1a62751aefe6bd0959e8f558fcfe591
2022-01-26 19:48:34 +00:00
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