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When performing an image upgrade and Linux Kernel command-line option that
should be passed via GRUB to the Linux Kernel are missing on the first boot.
This is because when generating the GRUB command-line via the op-mode scripts
the CLI nodes defining the options are not honored.
This commit re-implements the code-path in op-mode which generates the strings
passed via GRUB to the Linux Kernel command-line.
NOTE: If (for a yet unknown reason) a Kernel command-line option string changes
during a major - or minor - upgrade of the Linux Kernel, we will need to adapt
that logic and possibly call a helper from within the NEW updated image rootfs.
Thus we can ship future information back into the past like the "Grays Sports
Almanac" from Back to the Future Part II.
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