make mce-test a submodule

cloning mce-test from

    git://github.com/andikleen/mce-test.git

and use it as a submodule of git.

Signed-off-by: Caspar Zhang <caspar@casparzhang.com>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Andi Kleen <andi.kleen@intel.com>
Acked-by: Shubham Goyal <shubham@linux.vnet.ibm.com>
155 files changed