[PATCH] Kdump documentation update

o Kdump documentation update.
	- Update details for using relocatable kernel.
	- Start using kexec-tools-testing release as it is latest and old
	  kexec-tools can't load relocatable bzImage file.
	- Also add kdump on ia64 specific details.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: Horms <horms@verge.net.au>
Cc: Mohan Kumar M <mohan@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>