html report: fix IE compatibility errors

Alexandra Yates reported that c8a9e53854ad672529bee73a31c9c25382089ec8
broke IE (v8 - v10) compatibility.

the following issues were addressed:
-- IE up to v10 does not support object classList. workaround
by manual className manipulation.
-- IE has issues with textContent in some versions. workaround
by setting innerText.

Reported-and-tested-by: Alexandra Yates <alexandra.yates@intel.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>