lmbench: Fix "make html" graph failure

The html-list perl script cannot parse the first line of the result
files about the lmbench version.

Additional fixes are to make the result's html pages easier to understand.

Signed-off-by: Lin Yu <lin.yu@windriver.com>
Signed-off-by: Fupan Li <fupan.li@windriver.com>
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>