kexec-tools: Add vmcore-dmesg

vmcore-dmesg is a trivial utility to extract the dmesg from a vmcore.
This was written in reaction to problems I was having building
makedumpfile, and using makedumpfile for extracting dmesg.  makedumpfile
does a whole lot of things, uses a whole lot of libraries and which
make it hard to compile and a little bit clunky to remember the command
line switches.

So I have written the trivial vmcore-dmesg program that reads a vmcore
either /proc/vmcore or a saved version vmcore and writes the dmesg to stdout.

There is nothing to vmcore-dmesg and all of the arch dependencies are wrapped
up in generating the core file.  Which means a vmcore-dmesg should work with
core files of all architectures without needing a rebuild.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
[ horms@verge.net.au removed trailing white-space ]
Signed-off-by: Simon Horman <horms@verge.net.au>

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