initramfs-tools: make the panic argument available in the rescue shell

Sometimes one misses the error message printed by the panic helper function,
for example when attaching a serial console after the fact, or if kernel
messages resulting from udev activity obscure or scroll it away.

Please consider adding some facility like the attached patch.

Thanks,
Feri.

(closes: #569033)


Signed-off-by: maximilian attems <maks@debian.org>

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