xenserver-next / python-libs

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CP-53030: bootloader: add RPU chainloader

Doing RPU from a host with Secure Boot has extra challenges.

We can't do XS9 Shim -> XS9 GRUB -> XS10 Xen because
XS9 Shim can't verify XS10 Xen's signature.

We need to chainload XS10 Shim before loading any XS10 components.
XS9 Shim -> XS9 GRUB -> XS10 Shim -> XS10 Xen -> ...

After chainloading XS10 Shim the system will end up back in the same
GRUB menu so we also have a guard variable to ensure on first boot we
chainload the shim and on second been we proceed with the RPU.

Signed-off-by: Kevin Lampis <kevin.lampis@citrix.com>

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