qemu.test.cfg: Add cmd /c for windows disk write test

Add cmd /c to let the cmd session wait util the autoit scripts finished.
Otherwise it will return immediately after the autoit scripts start.
Also correct the script name.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
qemu.test.cfg: Add two sub test for windows disk write

Run CrystalDiskMark in guest during s3 and s4.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>