Add --reuse-cmdline

This patch adds an option "--reuse-cmdline" for people that are lazy in typing
--append="$(cat /proc/cmdline)". The advantage of "--reuse-cmdline" is also that
it strips off BOOT_IMAGE (since it may not be correct any more) from lilo and
other boot loaders, and, more important, the crashkernel option in case a
panic kernel is loaded.

If you like the option I can also add it for really all architectures. Tested only
with x86-bzImage both the kexec and kdump case.

Signed-off-by: Bernhard Walle <bwalle@suse.de>
Signed-off-by: Simon Horman <horms@verge.net.au>

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