grub-bhyve: support overriding just --root flag

[Fabian Freyer]

On 12 Nov 2017, at 0:46, Allan Jude wrote:
> Does libvirt support using the bhyve UEFI-CSM firmware instead? That
> would let the VM boot using the native grub installed inside the VM, and
> avoid this issue entirely. It also makes starting a bhyve a single
> command instead of 2.

Yes it does[1]. Also be aware that bootloader_args has some quoting issues.

CC’ing novel@ as he does a lot of the libvirt+bhyve driver stuff.

Fabian.

[1] https://libvirt.org/drvbhyve.html#uefi
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